Patent US3453429A successfully refreshed from Google Patents.
US3453429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal detector
Assignee: AT&T Inc
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Filing: 1967-07-21
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Granted: 1969-07-01
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Expires: 1987-07-21
Abstract
No abstract record available.
Inventors
- 👤 Michel A Duguay
- 👤 Joseph A Giordmaine
- 👤 Peter M Rentzepis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:19
CPC Classifications
G; G04; G04F; G04F13/00; G04F13/02; G04F13/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3070698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |