US2431942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-polarizing viewer for use in connection with stereoscopic pictures
Assignee: POLAROLD Corp
•
Filing: 1945-02-24
•
Granted: 1947-12-02
•
Expires: 1965-02-24
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2099694A
Cited
US2102632A
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FR834855A
Cited
US2169022A
Cited
FR841943A
Cited
GB517924A
Cited
US2165974A
Cited
US2179286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |