US2509366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light meter having reflecting means to receive light from two opposite directions
Assignee: Individual
•
Filing: 1947-08-25
•
Granted: 1950-05-30
•
Expires: 1967-08-25
Abstract
No abstract record available.
Inventors
- 👤 Perlin Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:43
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/02; G01J1/04; G03; G03B; G03B7/00; G03B7/08; G03B7/099
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1990396A
Cited
US2023159A
Cited
US2198971A
Cited
US2378433A
Cited
US2294876A
Cited
US2389617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |