US2579661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light measuring meter
Assignee: PHOTO RES CORP
•
Filing: 1949-04-28
•
Granted: 1951-12-25
•
Expires: 1969-04-28
Abstract
No abstract record available.
Inventors
- 👤 Freund Gertrude Elsbeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:21
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2048655A
Cited
US2058562A
Cited
GB476875A
Cited
US2278338A
Cited
US2330877A
Cited
US2389617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |