US3721801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sealer control
Assignee: Individual
•
Filing: 1969-08-26
•
Granted: 1973-03-20
•
Expires: 1989-08-26
Abstract
Abstract STRIP OR SHEET OF PLASTIC FILM IS FOLDED AND THE PLIES SEALED TOGETHER TO FORM ENVELOPES BY A SEALING HEAD HAVING AN INTERMITTENTLY HEATED EXPOSED SEALING ELEMENT. THE DURATION OF APPLICATION OF THE SEALING ELEMENT TO THE FILM IS AUTOMATICALLY CONTROLLED ACCORDING TO THE TEMPERATURE OF THE SEALING ELEMENT, THE SEALING HEAD BEING POWER OPERATED TO REMOVE THE SEALING ELEMENT FROM THE FILM WHEN THE SEALING ELEMENT REACHES A PREDETERMINED TEMPERATURE. D R A W I N G
Inventors
- 👤 F Bate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:30
CPC Classifications
H; H05; H05B; H05B3/00; B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/80; B29C66/81; B29C66/816; B29C66/8161; B29C66/82; B29C66/822; B29C66/8221; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8324; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91213; B29C66/91216; B29C66/91218; B29C66/91231; B29C66/9131; B29C66/91311; B29C66/91313; B29C66/91317; B29C66/914; B29C66/9141; B29C66/91421; B29C66/9161; B29C66/91651; B29C66/91655; B29C66/96; B29C66/961; B29C66/431; B29C66/4312; B29C66/43121; B29C66/94; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |