US3502971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test circuit including oscillator means,trigger means and switch means for determining voltage drop
Assignee: AT&T Inc
•
Filing: 1968-01-10
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Granted: 1970-03-24
•
Expires: 1988-01-10
Abstract
No abstract record available.
Inventors
- 👤 John J Glosek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:11
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3072895A
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US3026505A
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US3157870A
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US3243794A
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US3300689A
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US3277364A
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US3284707A
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US3341748A
Cited
US3300659A
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US3412392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |