US2447828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-polarizing prism
Assignee: Polaroid Corp
•
Filing: 1945-02-17
•
Granted: 1948-08-24
•
Expires: 1965-02-17
Abstract
No abstract record available.
Inventors
- 👤 Cutler D West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:31
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/283
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB398100A
Cited
US1963127A
Cited
US2274100A
Cited
US2246817A
Cited
US2241041A
Cited
US2315783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |