US3029345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic key-card system
Assignee: Individual
•
Filing: 1958-07-25
•
Granted: 1962-04-10
•
Expires: 1978-07-25
Abstract
No abstract record available.
Inventors
- 👤 David W Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:12
CPC Classifications
E; E05; E05B; E05B49/00; E05B49/002; E05B49/006; Y; Y10; Y10S; Y10S70/00; Y10S70/51; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2008150A
Cited
US2306784A
Cited
US2510347A
Cited
US2497405A
Cited
US2779874A
Cited
US2947875A
Cited
US2773219A
Cited
US2820926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |