Patent US2470277A successfully refreshed from Google Patents.
US2470277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical lens unit with image reversing means
Assignee: Sun Chemical Corp
•
Filing: 1946-10-25
•
Granted: 1949-05-17
•
Expires: 1966-10-25
Abstract
No abstract record available.
Inventors
- 👤 Stephen N Wekeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:15
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190500322A
Cited
FR388415A
Cited
GB313322A
Cited
GB330310A
Cited
US2019234A
Cited
US2137570A
Cited
US2085050A
Cited
US2257551A
Cited
US2280989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |