US2991690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereoscopic lens-prism optical system
Assignee: Polaroid Corp
•
Filing: 1953-09-04
•
Granted: 1961-07-11
•
Expires: 1973-09-04
Abstract
No abstract record available.
Inventors
- 👤 David S Grey
- 👤 Edwin H Land
- 👤 William H Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:09
CPC Classifications
G; G02; G02B; G02B30/00; G02B30/20; G02B30/34; G02B30/35
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL56706C
Cited
US840378A
Cited
US862354A
Cited
US1095932A
Cited
US1454218A
Cited
US1729617A
Cited
US1719443A
Cited
US1815208A
Cited
US1795092A
Cited
US1909222A
Cited
US1851317A
Cited
US1851705A
Cited
US1900241A
Cited
GB385623A
Cited
US1964968A
Cited
US2027675A
Cited
US2015527A
Cited
FR789755A
Cited
US2096425A
Cited
FR810769A
Cited
US2168273A
Cited
US2240728A
Cited
US2352026A
Cited
US2314174A
Cited
FR892759A
Cited
US2434378A
Cited
US2541014A
Cited
US2559881A
Cited
US2729138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |