Patent US2938977A successfully refreshed from Google Patents.
US2938977A
Expired / Lapsed
US
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Electric switching mat
Assignee: Tapeswitch Corp of America
•
Filing: 1958-09-02
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Granted: 1960-05-31
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Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 Robert H Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/02; H01H3/14; H01H3/141
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1915292A
Cited
US2583813A
Cited
US2728827A
Cited
US2796488A
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US2790872A
Cited
US2770696A
Cited
US2700080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |