Patent US2646637A successfully refreshed from Google Patents.
US2646637A
Expired / Lapsed
US
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Device for trans-illuminating transparencies
Assignee: Individual
•
Filing: 1950-01-26
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Granted: 1953-07-28
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Expires: 1970-01-26
Abstract
No abstract record available.
Inventors
- 👤 Richard N Nierenberg
- 👤 Mungall William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:58
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0013; G02B6/0023; G02B6/0031; G02B6/0033; G02B6/0035; G02B6/004; G02B6/0041; G02B6/0045; G02B6/0046; G02B6/005; G02B6/0066; G02B6/0068; G09; G09F; G09F13/00; G09F13/18; G09F2013/1804; G09F2013/1827; G09F2013/1831
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |