Patent US2851657A successfully refreshed from Google Patents.
US2851657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comparison type electrical test set
Assignee: AT&T Inc
•
Filing: 1955-02-04
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Granted: 1958-09-09
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Expires: 1975-02-04
Abstract
No abstract record available.
Inventors
- 👤 Robert K Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE515398A
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US383605A
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US610903A
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US1333892A
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US1347772A
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US1901488A
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US2468398A
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US2547011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |