Patent US3534499A successfully refreshed from Google Patents.
US3534499A
Expired / Lapsed
US
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Door opening apparatus
Assignee: Individual
•
Filing: 1969-01-27
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Granted: 1970-10-20
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Expires: 1989-01-27
Abstract
No abstract record available.
Inventors
- 👤 Bertran J Chaffee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:08
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/70; E05F15/73; E05F15/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2096902A
Cited
US2403609A
Cited
US2408576A
Cited
US2665129A
Cited
US3181856A
Cited
US3396279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |