US3147408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity switch system
Assignee: Individual
•
Filing: 1961-08-07
•
Granted: 1964-09-01
•
Expires: 1981-08-07
Abstract
No abstract record available.
Inventors
- 👤 Yamamoto Mititaka
- 👤 Abe Akira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/9537; H03K17/9542; H03K17/9547
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2590826A
Cited
US2907931A
Cited
US2806181A
Cited
US2848658A
Cited
US3015077A
Cited
US2954479A
Cited
US3042839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |