US2699086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for measuring physical brightness and physical brightness ratios
Assignee: University of California Berkeley
•
Filing: 1950-05-22
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Granted: 1955-01-11
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Expires: 1970-05-22
Abstract
No abstract record available.
Inventors
- 👤 Dan M Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:37
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1556766A
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US1546264A
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US1969626A
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US2198971A
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US2308469A
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US2154374A
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US2244507A
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US2419914A
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US2478163A
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US2498506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |