US3428829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal amplitude measuring system
Assignee: AT&T Inc
•
Filing: 1965-12-23
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Granted: 1969-02-18
•
Expires: 1985-12-23
Abstract
No abstract record available.
Inventors
- 👤 Gerald D Haynie
- 👤 Peter E Rosenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:10
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/0046; G01R19/0053; G11; G11C; G11C27/00; G11C27/02; G11C27/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735007A
Cited
US2879392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |