Patent US2082104A successfully refreshed from Google Patents.
US2082104A
Expired / Lapsed
US
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Testing system
Assignee: AT&T Inc
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Filing: 1936-01-09
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Granted: 1937-06-01
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Expires: 1956-01-09
Abstract
No abstract record available.
Inventors
- 👤 Earl S Gibson
- 👤 Arnold A Hansen
- 👤 John B Worth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-05-31 | 1940-11-30 | 1941-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-31 | 1944-11-30 | 1945-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-31 | 1948-11-30 | 1949-06-01 | $7700.00 | Window Closed / Lapsed |