Patent US3438826A successfully refreshed from Google Patents.
US3438826A
Expired / Lapsed
US
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Method of heat sealing the container edges of plastic foam material by flame contact
Assignee: Kitchens of Sara Lee Inc
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Filing: 1966-01-26
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Granted: 1969-04-15
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Expires: 1986-01-26
Abstract
No abstract record available.
Inventors
- 👤 Hans Van Eikeren
- 👤 Berthold L Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:06
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/003; B29C65/00; B29C65/02; B29C65/10; B29C65/106; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/131; B29C66/1312; B29C66/50; B29C66/51; B29C66/54; B29C66/549; B29C66/70; B29C66/71; B29C66/72; B29C66/727; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/812; B29C66/8126; B29C66/81261; B29C66/818; B29C66/8181; B29C66/81815; B29C66/83; B29C66/832; B29C66/8322; B29C2793/00; B29C2793/0081; B29C66/83221; B29K; B29K2105/00; B29K2105/04; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1051; Y10T156/1052; Y10T156/1062; Y10T156/1066
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
THE METHOD OF CONSTRUCTING A SEALED CONTAINER OF CELLULAR FOAM PLASTIC WHICH COMPRISES FOLDING THE CONTAINER ABOUT A MEDIAN LINE TO PROVIDE THREE REMAINING EDGES IN ABUTTING SIDE-TO-SIDE RELATIONSHIP, WHICH COMPRISES CLAMPING THE SIDE-TO-SIDE SURFACES INTO TIGHT SURFACE CONTACT WITH EACH OTHER BETWEEN A PAIR OF HIGHLY HEAT-CONDUCTIVE CLAMP ELEMENTS, SLICING THE EDGES OF THE CONTAINER BACK TO THE EDGES OF THE CLAMP ELEMENTS LEAVING SUBSTANTIALLY NO PROJECTING CONTAINER MATERIAL EXTENDING BEYOND THE CLAMP ELEMENTS, AND DIRECTING A FLAME AGAINST THE THUS SLICED EDGES FROM ADJACENT THERETO BUT SPACED THEREFROM TO HEAT SEAL SAID EDGES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |