Patent US3490981A successfully refreshed from Google Patents.
US3490981A
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US
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Apparatus for heat sealing plastic film
Assignee: Individual
•
Filing: 1967-03-27
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Granted: 1970-01-20
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Expires: 1987-03-27
Abstract
No abstract record available.
Inventors
- 👤 Frank Garrett Shanklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/14; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/222; B29C65/223; B29C65/229; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/24; B29C66/244; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/818; B29C66/82; B29C66/822; B29C66/8221; B29C66/8226; B29C66/82263; B29C66/8227; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8324; B29C66/84; B29C66/849
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2509439A
Cited
US2725091A
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US3015600A
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US2919530A
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US3016673A
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US3239993A
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US3323282A
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US3369953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |