Patent US3226491A successfully refreshed from Google Patents.
US3226491A
Expired / Lapsed
US
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Telephone switch control device
Assignee: Individual
•
Filing: 1961-12-04
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Granted: 1965-12-28
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Expires: 1981-12-04
Abstract
No abstract record available.
Inventors
- 👤 Harold G Spangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:22
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/04; H04M1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1979588A
Cited
US2098771A
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US2140655A
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US2311322A
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US2338757A
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US2414307A
Cited
US2597670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |