US2617329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable light transmission device comprising relatively movable polarized members
Assignee: Individual
•
Filing: 1947-07-22
•
Granted: 1952-11-11
•
Expires: 1967-07-22
Abstract
No abstract record available.
Inventors
- 👤 John F Dreyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:42
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/281
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2313349A
Cited
US2393969A
Cited
US2218875A
Cited
US2280358A
Cited
US2351932A
Cited
US2313831A
Cited
US2281112A
Cited
US2255933A
Cited
US2398506A
Cited
US2450761A
Cited
US2464954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |