US2530843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic enlarger
Assignee: EUGENE F HARTLEY
•
Filing: 1948-01-03
•
Granted: 1950-11-21
•
Expires: 1968-01-03
Abstract
No abstract record available.
Inventors
- 👤 Clarence C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:26
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1313815A
Cited
US767571A
Cited
US1097211A
Cited
US1517742A
Cited
US1572899A
Cited
US1920671A
Cited
US2009262A
Cited
US2113309A
Cited
US2117754A
Cited
US2254125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |