US2457170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical projection apparatus
Assignee: International Standard Electric Corp
•
Filing: 1944-06-08
•
Granted: 1948-12-28
•
Expires: 1964-06-08
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:15
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US733090A
Cited
US1371458A
Cited
US1424556A
Cited
US1421042A
Cited
US1589349A
Cited
US1957448A
Cited
US2066435A
Cited
US2051593A
Cited
US2019234A
Cited
US2035780A
Cited
US2179799A
Cited
US2155248A
Cited
US2365613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |