Patent US2827538A successfully refreshed from Google Patents.
US2827538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated eyepiece and process of manufacture
Assignee: Individual
•
Filing: 1954-10-11
•
Granted: 1958-03-18
•
Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Polis Samuel
- 👤 Nicoletti Domenick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:58
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/002; H05B2203/004; H05B2203/005; H05B2203/014; H05B2203/017
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US761204A
Cited
US2149507A
Cited
US2222742A
Cited
GB537688A
Cited
US2275228A
Cited
US2439892A
Cited
US2427557A
Cited
GB599617A
Cited
US2470509A
Cited
US2473183A
Cited
US2631219A
Cited
FR1027350A
Cited
US2623150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |