US2865247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound photometric device
Assignee: PHOTO RES CORP
•
Filing: 1955-10-10
•
Granted: 1958-12-23
•
Expires: 1975-10-10
Abstract
No abstract record available.
Inventors
- 👤 Frank F Crandell
- 👤 George D Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2016025A
Cited
GB412096A
Cited
US2147902A
Cited
US2190553A
Cited
US2337122A
Cited
US2462823A
Cited
US2587602A
Cited
US2585245A
Cited
US2695547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |