US2691918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminating means for optical instruments
Assignee: American Optical Corp
•
Filing: 1952-04-12
•
Granted: 1954-10-19
•
Expires: 1972-04-12
Abstract
No abstract record available.
Inventors
- 👤 Richard S Robins
- 👤 Walter J Krasniewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:21
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1015730A
Cited
US1351562A
Cited
US2059197A
Cited
US2099012A
Cited
US2144653A
Cited
US2209532A
Cited
US2277697A
Cited
US2471879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |