US3394976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency responsive apparatus
Assignee: Unisys Corp
•
Filing: 1963-05-31
•
Granted: 1968-07-30
•
Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 Robert D Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:46
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; G; G01; G01H; G01H9/00; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2202541A
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US2245563A
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US2534961A
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US2582793A
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US3118110A
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US3052843A
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US2951736A
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US3146057A
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US3112360A
Cited
US3224279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |