Patent US2220136A successfully refreshed from Google Patents.
Patent US2669901A successfully refreshed from Google Patents.
US2669901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system adaptable to stereoscopic projectors, viewers, and television
Assignee: Individual
•
Filing: 1950-07-11
•
Granted: 1954-02-23
•
Expires: 1970-07-11
Abstract
No abstract record available.
Inventors
- 👤 Rehorn Miles Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:33
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G03; G03B; G03B35/00; G03B35/18; G03B35/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1503766A
Cited
US1899032A
Cited
US1959498A
Cited
US2084350A
Cited
US2249061A
Cited
US2246817A
Cited
GB519488A
Cited
US2178145A
Cited
US2301826A
Cited
DE706588C
Cited
US2282947A
Cited
US2255631A
Cited
US2263316A
Cited
US2348410A
Cited
US2437061A
Cited
US2449287A
Cited
GB634890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |