Patent US3157420A successfully refreshed from Google Patents.
US3157420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latch lock for casement window
Assignee: Individual
•
Filing: 1961-12-13
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Granted: 1964-11-17
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Expires: 1981-12-13
Abstract
No abstract record available.
Inventors
- 👤 Milton A Sulkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:31
CPC Classifications
E; E05; E05C; E05C3/00; Y; Y10; Y10S; Y10S292/00; Y10S292/33; Y10T; Y10T292/00; Y10T292/08; Y10T292/1039; Y10T292/1041; Y10T292/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |