Patent US4296500A successfully refreshed from Google Patents.
Patent US2701979A successfully refreshed from Google Patents.
US2701979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unit system reader for cumulative microfilm and the like
Assignee: Individual
•
Filing: 1951-07-13
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Granted: 1955-02-15
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Expires: 1971-07-13
Abstract
No abstract record available.
Inventors
- 👤 Verneur E Pratt
- 👤 George F Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:52
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/115
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1987067A
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US2163593A
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US2226618A
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US2256178A
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US2260552A
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US2353241A
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US2477923A
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US2484448A
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US2511646A
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US2573278A
Cited
US2501453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |