US2527043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical instrument illumination device
Assignee: United States Radium Corp
•
Filing: 1949-04-16
•
Granted: 1950-10-24
•
Expires: 1969-04-16
Abstract
No abstract record available.
Inventors
- 👤 Clarence W Wallhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:08
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/32; G02B27/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US863287A
Cited
US1150118A
Cited
US1269636A
Cited
US1302353A
Cited
US1529643A
Cited
US2140269A
Cited
US2356267A
Cited
US2403316A
Cited
US2476340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |