Patent US2690481A successfully refreshed from Google Patents.
US2690481A
Expired / Lapsed
US
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Switch for automatic safety locking devices and systems
Assignee: Individual
•
Filing: 1949-03-25
•
Granted: 1954-09-28
•
Expires: 1969-03-25
Abstract
No abstract record available.
Inventors
- 👤 Helen E Courtney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:28
CPC Classifications
E; E05; E05B; E05B77/00; E05B77/46; E05B77/48; Y; Y10; Y10T; Y10T70/00; Y10T70/60
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |