Patent US2692728A successfully refreshed from Google Patents.
US2692728A
Expired / Lapsed
US
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Testing system
Assignee: AT&T Inc
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Filing: 1946-12-17
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Granted: 1954-10-26
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Expires: 1966-12-17
Abstract
No abstract record available.
Inventors
- 👤 Walter B Strickler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/40; G06F7/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2098359A
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US2098248A
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US2074392A
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US2146834A
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US2254932A
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US2386763A
Cited
US2393386A
Cited
GB600896A
Cited
US2616624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |