US3528104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bridge circuit methods of and apparatus for testing and locating faults in electrical circuits
Assignee: AT&T Inc
•
Filing: 1968-03-08
•
Granted: 1970-09-08
•
Expires: 1988-03-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Ehlschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:50
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/66; G01R31/67; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2456499A
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US2635135A
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US2822519A
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US2950437A
Cited
US2799013A
Cited
US2964701A
Cited
US3178639A
Cited
US3405357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |