Patent US2660466A successfully refreshed from Google Patents.
US2660466A
Expired / Lapsed
US
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Doorknob and tubular spindle assembly
Assignee: HOLLYMADE HARDWARE Manufacturing Co
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Filing: 1952-08-08
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Granted: 1953-11-24
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Expires: 1972-08-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert C Cerf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:07
CPC Classifications
E; E05; E05B; E05B3/00; E05B3/003; Y; Y10; Y10T; Y10T292/00; Y10T292/85; Y10T292/865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1325639A
Cited
US1289867A
Cited
US1519503A
Cited
US1981289A
Cited
US2222018A
Cited
US2369494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |