US2727772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic lock
Assignee: Individual
•
Filing: 1953-11-05
•
Granted: 1955-12-20
•
Expires: 1973-11-05
Abstract
No abstract record available.
Inventors
- 👤 Alexander W Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:15
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/16; E05C19/166; E05C19/168; E05B; E05B15/00; E05B15/10; E05B15/101; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/1014; Y10T292/1021; Y10T292/68; Y10T292/696
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) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |