US2454280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated indicator using light polarizing elements
Assignee: Individual
•
Filing: 1945-07-13
•
Granted: 1948-11-23
•
Expires: 1965-07-13
Abstract
No abstract record available.
Inventors
- 👤 George K C Hardesty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:36
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2192860A
Cited
US1629680A
Cited
US1929668A
Cited
US2018214A
Cited
US2018963A
Cited
US2070787A
Cited
US2123743A
Cited
US2165974A
Cited
US2313923A
Cited
US2261957A
Cited
US2393968A
Cited
US2313831A
Cited
US2316644A
Cited
US2359457A
Cited
US2404746A
Cited
US2395718A
Cited
US2427896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |