Patent US2397231A successfully refreshed from Google Patents.
US2397231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing coated light polarizers
Assignee: Polaroid Corp
•
Filing: 1941-11-15
•
Granted: 1946-03-26
•
Expires: 1961-11-15
Abstract
No abstract record available.
Inventors
- 👤 Carl E Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:33
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/12; C08J7/123; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; C08J2333/12; C08J2461/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-03-25 | 1949-09-24 | 1950-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-03-25 | 1953-09-24 | 1954-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-03-25 | 1957-09-24 | 1958-03-26 | $7700.00 | Window Closed / Lapsed |