US2461668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film holder for photographic enlargers
Assignee: Individual
•
Filing: 1946-10-24
•
Granted: 1949-02-15
•
Expires: 1966-10-24
Abstract
No abstract record available.
Inventors
- 👤 William D Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:42
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/62; G03B27/6271; G03B27/6285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1208664A
Cited
US1219712A
Cited
US2174660A
Cited
US2294622A
Cited
US2251077A
Cited
US2266908A
Cited
US2351371A
Cited
US2369981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |