Patent US3526729A successfully refreshed from Google Patents.
US3526729A
Expired / Lapsed
US
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Transmission measuring system with harmonic generating means
Assignee: AT&T Inc
•
Filing: 1966-04-13
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Granted: 1970-09-01
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Expires: 1986-04-13
Abstract
No abstract record available.
Inventors
- 👤 Frederick T Andrews Jr
- 👤 Doren Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:17
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04M3/301; G; G01; G01R; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB656188A
Cited
US3189694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |