US3546734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable backcheck mechanism for door closers
Assignee: Schlage Lock Co LLC
•
Filing: 1968-07-10
•
Granted: 1970-12-15
•
Expires: 1988-07-10
Abstract
No abstract record available.
Inventors
- 👤 Roy L Pollack
- 👤 David G Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:08
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/04; E05F3/10; E05F3/102; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US627828A
Cited
US1123810A
Cited
US1178688A
Cited
US1152339A
Cited
US2059385A
Cited
US2586135A
Cited
US3426383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |