US2550852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catch
Assignee: National Lock Co
•
Filing: 1946-03-29
•
Granted: 1951-05-01
•
Expires: 1966-03-29
Abstract
No abstract record available.
Inventors
- 👤 Edwin W North
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:39
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/02; E05C19/026; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0814; Y10T292/0818
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US528327A
Cited
US1612480A
Cited
AT123180B
Cited
GB419365A
Cited
US2244344A
Cited
US2414662A
Cited
US2451798A
Cited
US2472498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |