Patent US2431356A successfully refreshed from Google Patents.
US2431356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film holder
Assignee: Individual
•
Filing: 1945-02-27
•
Granted: 1947-11-25
•
Expires: 1965-02-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick P Willcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:47
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US370370A
Cited
US437656A
Cited
FR2244E
Cited
US708370A
Cited
US894582A
Cited
US925895A
Cited
GB191100483A
Cited
US1631479A
Cited
US2344951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |