US3539749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movable contacts with oppositely inclined keying slots for providing wiping action in a pushbutton switch
Assignee: AT&T Inc
•
Filing: 1968-12-18
•
Granted: 1970-11-10
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Expires: 1988-12-18
Abstract
No abstract record available.
Inventors
- 👤 Alexander M Macpheat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/12; H01H1/00; H01H1/12; H01H1/14; H01H1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR733974A
Cited
US2577960A
Cited
DE1139185B
Cited
GB956565A
Cited
US3229053A
Cited
US3201531A
Cited
US3355558A
Cited
US3392251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |