US3736219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealed polyester film
Assignee: 3M Co
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Filing: 1971-08-30
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Granted: 1973-05-29
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Expires: 1991-08-30
Abstract
Abstract ORIENTED, HEAT SET POLYETHYLENE TEREPHTHALATE FILM EDGES CAN BE JOINED IN A STRONG, FLEXIBLE SEAL BY PASSING SUPERPOSED CONGRUENT EDGES OVER A GAS FLAME UNDER CONDITIONS WHICH FUSE THE EDGES INTO A BEAD HAVING AN ELLIPTICAL CROSS SECTION OF SPECIFIC DIMENSIONS AND CONFIGURATION.
Inventors
- 👤 Taggart L Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:38
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/10; B29C65/106; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/137; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/836; B29C2793/00; B29C2793/0081; B29K; B29K2067/00; Y; Y10; Y10S; Y10S383/00; Y10S383/908; Y10S428/00; Y10S428/91; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1052; Y10T156/108; Y10T156/1084; Y10T156/1085; Y10T428/00; Y10T428/24; Y10T428/24777
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |