Patent US2454927A successfully refreshed from Google Patents.
US2454927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knob construction for locks
Assignee: KEIL LOCK CO Inc
•
Filing: 1945-02-02
•
Granted: 1948-11-30
•
Expires: 1965-02-02
Abstract
No abstract record available.
Inventors
- 👤 Ludwig J Kalwo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:00
CPC Classifications
E; E05; E05B; E05B1/00; E05B1/0007; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49599; Y10T292/00; Y10T292/82
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE489594C
Cited
US354607A
Cited
US491292A
Cited
US590781A
Cited
US192586A
Cited
US732973A
Cited
GB190328433A
Cited
US812871A
Cited
US1137800A
Cited
US1148549A
Cited
US1483435A
Cited
US1532765A
Cited
US1605123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |