Patent US2503389A successfully refreshed from Google Patents.
US2503389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope with self-contained illuminator and rotatable diaphragm
Assignee: American Optical Corp
•
Filing: 1946-10-18
•
Granted: 1950-04-11
•
Expires: 1966-10-18
Abstract
No abstract record available.
Inventors
- 👤 John J Host
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:29
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US328277A
Cited
US1461367A
Cited
US1512785A
Cited
US1631329A
Cited
US2135870A
Cited
US2056421A
Cited
US2206180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |