Patent US2786389A successfully refreshed from Google Patents.
US2786389A
Expired / Lapsed
US
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Microscopic inspection apparatus
Assignee: AT&T Inc
•
Filing: 1954-04-08
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Granted: 1957-03-26
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Expires: 1974-04-08
Abstract
No abstract record available.
Inventors
- 👤 Wesley F Bennett
- 👤 William R Yeich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:18
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1896828A
Cited
US1703933A
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US1789009A
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US1868908A
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US2021232A
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US2192529A
Cited
US2373930A
Cited
US2398139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |