US2545274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable filter darkroom light
Assignee: Individual
•
Filing: 1947-06-25
•
Granted: 1951-03-13
•
Expires: 1967-06-25
Abstract
No abstract record available.
Inventors
- 👤 Alton H Golden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:23
CPC Classifications
G; G03; G03D; G03D17/00; Y; Y10; Y10S; Y10S362/00; Y10S362/803
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US400140A
Cited
US548369A
Cited
US605529A
Cited
US1374714A
Cited
DE412240C
Cited
US1891971A
Cited
US1997687A
Cited
US2297974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |