Origin · 9 of 10 · 2026-08-26

The bag that hissed

The theater already had a tub. Two chapters back is the hybrid and the belt: a specification a processor could write into a grower contract. The last chapter is the foil pan and the TV tray. Television emptied the seats those SKUs had been built around. The recovery was a grocery package you shook over a burner. What the next generation of grocery did was take the burner out. Two technologies met: a home microwave cheap enough to sit on a counter, and a disposable bag that could focus energy, contain steam, and dump a seasoned load. This chapter is that bag as a center-store SKU. Not the oven. Not a second Watkins biography. The foil pan already had its hiss. This one is paper.

The lives are recorded separately. James D. Watkins's Edina years belong to the life piece. Percy Spencer is an honorable mention on the magnetron, not a wall life on this page. Lawrence C. Brandberg and David W. Andreas have no people essays. Hunt-Wesson's 1976 purchase of the Orville brand is essay 7. This chapter is the industrial change: fridge, then shelf, then category.

A magnetron is not a grocery SKU

Spencer's contribution is real and it is the wrong object.

U.S. Patent 2,495,429, "Method of treating foodstuffs," lists Percy L. Spencer of West Newton, Massachusetts, assignor to Raytheon Manufacturing Company. It was filed 8 October 1945 and issued 24 January 1950. The claims are for generating electromagnetic energy in the microwave region, concentrating it, and exposing a foodstuff long enough to cook it. The Smithsonian's invention biography, which checked Maine birth records, dates Spencer 9 July 1894 to 7 September 1970 and records the lab sequence in one sentence that is enough: a melted candy bar, then popcorn kernels by a magnetron, then an egg. That is the oven.

U.S. Patent 2,480,679, "Prepared food article and method of preparing," filed 29 March 1947 and issued 30 August 1949, is the popcorn-specific Spencer grant. It is an unshelled ear, seasoned, sealed in a bag transparent to radio-frequency energy, popped in a cavity in 20 to 45 seconds. The bag catches kernels that fly off the cob. That is a demonstration food, not a grocery SKU of shelled kernels, fat, and salt. Popcorn.org's later history still folds Spencer's experiments into the origin of microwave popcorn as a household product, and dates the grocery family to "the early 1980's." The patents will not carry that fold. Spencer invented a use of the magnetron. He did not invent the bag that made popcorn a center-store category.

A cheap home oven was the other half of the meeting. Smithsonian dates a compact Amana unit to 1967, then "a couple of decades" before the appliance became ordinary. The bag still had to be invented.

Pillsbury's bag, butter excluded

The grocery bag begins at Pillsbury.

U.S. Patent 3,973,045, "Popcorn package for microwave popping," lists Lawrence C. Brandberg and David W. Andreas as inventors, assignors to the Pillsbury Company. It was filed 14 May 1973 and issued 3 August 1976. The package is a flexible, expandable, gusseted bag of two paper plies, kraft outside, glassine liner, sealed so steam will inflate it. A charge of about eight parts corn is mixed with one to five parts shortening and salt. The specification is explicit: "Butter will not serve the purpose of the invention and is specifically excluded." One preferred formula is yellow popcorn 66.6 percent, coconut oil 25.0 percent, and salt 8.4 percent. The packages were meant for refrigerated vending and for institutional ovens of about 600 to 1,400 watts.

The Weaver court later found that Pillsbury introduced that bag, without microwave-interactive material, in the early to mid-1970s, and that Golden Valley sold a bag that "corresponded to the structure disclosed" in the Brandberg patent during the 1970s and early 1980s. Andreas was a co-inventor on the Pillsbury grant and later a named inventor, with Watkins and David H. Cox, on Golden Valley's susceptor patents. The court is the source for that migration. This record invents no biographies for Brandberg or Andreas.

Pillsbury's product was real enough to mention and not the grocery phenomenon. It needed cold. Mid-1970s refrigerated vending is a channel, not a pantry staple. Watkins's later work starts from that bag, not from Spencer's cob.

Cold first

The independent firm is September 1978, Edina, Minnesota. The life piece has the Pillsbury tenure, the thin personal file, and the Rochester claim that is not a vital record. This chapter does not reopen that file. Popz's later company page dates "Jim Watkins sells his first bag of microwave popcorn" to 1971. Treat 1971 as a company sentence about work that, on the court record, was still Pillsbury's.

U.S. Patent 4,450,180, "Package for increasing the volumetric yield of microwave cooked popcorn," lists James D. Watkins as the sole inventor. It was filed 7 July 1980 and issued 22 May 1984, assigned to Golden Valley Foods, Inc. The specification cites Brandberg 3,973,045 as prior art in which the charge is "distributed throughout the full cross section of the bag." Watkins's claim is narrower and mechanical. The bag is of "collateral tubular configuration": two parallel longitudinal tubes that communicate at the center. Substantially all of the charge of popcorn and fat goes in one tube. The filled tube sits down on the oven floor. The empty tube is free to expand.

A formula given as satisfactory is 68.5 percent corn, 27.6 percent fat, 2.8 percent salt, the fat hydrogenated coconut oil. "Packages are shipped frozen and maintained under refrigerated conditions prior to use." That sentence is the Act I constraint written into the patent. There is no susceptor in 4,450,180. There is a paper bag, a lateral charge, and a freezer.

Act I, on the chronology the life piece already printed, launched in 1981. Later brand pages say it used real butter and therefore had to be stored cold. The 1980 Watkins specification uses coconut oil and still requires refrigeration. This record prints the patent formula as the patent formula and the later brand claim of real butter as the later brand claim. What is not in dispute is the channel: refrigerated vending and the freezer case. A product that needed a cooler could not become a pantry staple.

1983 and 1984, no gold medal

The bag that crossed that limit is a different invention, and Watkins is not its only author.

The Weaver court reconstructed the sequence from testimony and files. A susceptor is a microwave-interactive layer that becomes hot. In about July 1982 Golden Valley saw one under Totino's Pizza, a Pillsbury product, and asked James River Corporation about its "heater pad," sold as Qwik Crisp. James River would not sell it then. In October 1983 Golden Valley saw a Wyandot popcorn container with a similar patch under corn and oil. It obtained Qwik Crisp roll stock in March or April 1984 and tested it inside the bag, outside the bag, and between the two plies. "In October of 1984, Golden Valley publicly introduced its ACT II bag in which susceptor material was bonded between the plies of its conventional popcorn bag."

That sentence, from Judge William C. Lee's findings, is the best dated public introduction this atlas has for Act II. The product was shelf-stable. Later brand pages call this "the first mass-marketed microwave popcorn." Hunt-Wesson's corporate history, retrieved on FundingUniverse and on encyclopedia.com from the same International Directory of Company Histories text, says something else. The company bought Orville Redenbacher in 1976, began exploring a microwave product in 1980, and "by 1983 it introduced the first shelf stable microwave popcorn, Orville Redenbacher's Microwave Popping Corn."

Hunt-Wesson's own later bag patent is not a gold medal either. U.S. 4,571,337, assigned to Hunt-Wesson Foods, issued 18 February 1986 on a continuation of a 10 May 1984 filing. The specification says a shortening solid at room temperature needs no refrigeration: "the product is thus shelf-stable." That is a 1984 pantry-bag filing. It is not a 1983 on-sale date, and it is not a first.

Do not award an uncontested gold medal. Print both dates. Hunt-Wesson claims first shelf-stable in 1983. Act II's claim is first mass-marketed in 1984, susceptor bonded between plies, publicly introduced in October. "Launched" and "category-defining" are not the same word. The Times search snippet, which this essay did not read as a full page, has Pillsbury with a frozen microwave popcorn in 1982 and Redenbacher on the microwave scene in 1983. Those sentences sit beside the Directory and the court. They do not settle primacy.

James River made the heater stock. Wyandot had already sold a box with a patch under the charge. Brandberg and Andreas had already sold the two-ply bag. Watkins, Andreas, and Cox put a patch between those plies and shipped a pantry product. The commercial bag is the grocery fact. The later unenforceable sheet patents are the life piece's legal coda. This chapter does not retry that suit.

Fifty-three million, then a billion

By 1987 the category was a grocery fight. The New York Times of 22 June 1987, in the sentences the Times search snippet still prints, said 1983, "the first full year that microwave popcorn was available nationally," generated $53 million at retail, per Packaged Facts, and that "last year" consumers popped an estimated $250 million, per the Popcorn Institute. The same snippet has Redenbacher and General Mills's Betty Crocker Pop Secret each at about 26 percent of the market, measured in retail dollars. This essay did not retrieve the full page. Those figures are the ones the snippet will support.

UPI, writing from the announcement week in April 1991, called the retail microwave popcorn market a $1 billion category. Conagra already held about 20 percent with Redenbacher, "the leader in retail sales," and would gain "a 30 percent share of the general merchandise market with Golden Valley's Act II brand." Stephen Carnes of Piper, Jaffray & Hopwood told UPI that put Conagra "at the undisputed top of the heap in microwave popcorn."

The Times of 23 April 1991 ran the deal under the headline "COMPANY NEWS; Conagra to Buy Popcorn Maker." This essay did not retrieve that body. UPI, the day before, did. Conagra and Golden Valley, already joint-venture partners in Lamb-Weston, agreed to a stock swap UPI valued at about $496 million. Completion, Conagra said, should come in June, subject to shareholder approval. A later Conagra Form 10-K, for the fiscal year ended 26 May 2002, lists "Golden Valley Microwave Foods in 1992" among its more significant acquisitions, after Beatrice in 1990. Print the April 1991 announcement and the later fiscal listing. Do not invent a close date this record did not retrieve as an 8-K.

Conagra already owned Orville Redenbacher. It had bought Beatrice, and with it Hunt-Wesson, in 1990. The 1991 deal did not introduce Omaha to popcorn. It combined the gourmet brand with the mass Act II bag. The life piece has the rest of the sale. This chapter stops at the category that no longer needed a refrigerator.

What this means for a map of living farms

This atlas is a record of farms, kernels, brands, and the people who still grow a crop that predates the companies selling it. The line is blunt. We keep the record. Nobody buys a ranking.

The industrial record is short enough to hold in one hand. 1945-50: Spencer files and is granted an oven method; 1947-49, an unshelled ear in a demonstration bag. 1973-76: Brandberg and Andreas file and are granted an expandable two-ply paper bag, butter excluded, built for a cooler. 1978: Golden Valley, Edina, September. 1980-84: Watkins's yield bag, coconut oil, still frozen. 1981: Act I, refrigerated. 1983: Hunt-Wesson claims first shelf-stable Orville microwave. 1984: Act II, October, susceptor between plies, publicly introduced; Hunt-Wesson files a shelf-stable bag of its own. 1987: $53 million in 1983, about $250 million in 1986, on the Times snippet. 1991: Conagra announces the Golden Valley buy. A later 10-K lists 1992. The lives are other pages.

Those stories that flatten the file are not harmless. Spencer inventing microwave popcorn does the same work a Chief X does: it gives the grocery bag a single father and makes Brandberg, Andreas, James River, and Watkins disappear. An uncontested first shelf-stable, awarded to 1983 or to 1984, does the same work a world's-fair scoop does. Act I as "real butter," against a 1980 specification that names coconut oil, prefers a later brand page to the patent. Popz's 1971 first bag, printed as the founding, erases September 1978. A Conagra buy in "the late 1990s" prefers a blog to UPI. Diacetyl as a living-room danger belongs to the next essay: the disease was occupational, in mixing rooms, not living rooms. Essay 1 already closed Thanksgiving and 80,000-year pollen. They stay closed. The foil pan already had its chapter. It does not eat this one.

The crop is older than the parlor. The parlor is older than the street machine. The street machine is older than the boxed confection. The boxed confection is older than the grocery tin. The tin is older than the lobby. The lobby is older than the hybrid contract. The hybrid contract is older than the foil pan on the TV tray. The foil pan is older than the bag that hissed. The bag that hissed starts when a grocery SKU detaches popcorn from the burner and attaches it to a counter oven, first from a cooler, then from the shelf. No one invented home popping. Spencer showed that microwaves pop corn. Pillsbury patented the expandable package. Watkins left, founded a company in September 1978, sold a cold Act I in 1981 and a dry Act II in 1984, and sold the company to Conagra in 1991. Hunt-Wesson has a 1983 shelf-stable claim that a serious chronology must print beside that October. What a ranking can do, if it is honest, is refuse a magnetron father for a grocery bag, refuse an uncontested first, print coconut oil against the later butter claim, print 1983 against 1984, print 1991 against 1992, leave diacetyl for the mixing-room chapter, invent no Watkins birth year, and point his life back to the life piece. The bag is the change. The oven was already there.