Patent US2788495A successfully refreshed from Google Patents.
US2788495A
Expired / Lapsed
US
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Coupling circuit
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1953-07-09
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Granted: 1957-04-09
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Expires: 1973-07-09
Abstract
No abstract record available.
Inventors
- 👤 Albert E Hylas
- 👤 Walter V Tyminski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/48; H03H7/482
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1591660A
Cited
US1753308A
Cited
US2013140A
Cited
US2237796A
Cited
US2358520A
Cited
US2333148A
Cited
US2709219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |