Patent US3409731A successfully refreshed from Google Patents.
US3409731A
Expired / Lapsed
US
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Force-cooled cable system
Assignee: RITA F SCHIFREEN
•
Filing: 1966-03-18
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Granted: 1968-11-05
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Expires: 1986-03-18
Abstract
No abstract record available.
Inventors
- 👤 Lester H Fink
- 👤 Kahn Frank
- 👤 Rita F Schifreen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:35
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1896841A
Cited
US1789229A
Cited
US2424388A
Cited
US2707095A
Cited
US2966341A
Cited
US3007203A
Cited
US3233035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |