Patent US2470176A successfully refreshed from Google Patents.
US2470176A
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Surface comparison microscope having light conducting members providing grazing and diffuse illumination
Assignee: Bausch and Lomb Inc
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Filing: 1946-03-18
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Granted: 1949-05-17
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Expires: 1966-03-18
Abstract
No abstract record available.
Inventors
- 👤 Lindgren Nils
- 👤 Paul A Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:36
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1976270A
Cited
US1873149A
Cited
US2065059A
Cited
US2184750A
Cited
US2214595A
Cited
US2221152A
Cited
US2286430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |