Patent US3548444A successfully refreshed from Google Patents.
US3548444A
Expired / Lapsed
US
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Door closure device with time delay means
Assignee: General Electric Co
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Filing: 1969-02-28
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Granted: 1970-12-22
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Expires: 1989-02-28
Abstract
No abstract record available.
Inventors
- 👤 Dwight W Jacobus
- 👤 Eugene N Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:20
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/1008; E05F1/002; E05F1/008; F; F25; F25C; F25C5/00; F25C5/20; F25C5/22; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/47; E05Y2201/49
Claims Analysis
Total Claims: 0
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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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |