Patent US2621564A successfully refreshed from Google Patents.
US2621564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical eyepiece, particularly for wide angles
Assignee: Individual
•
Filing: 1950-09-07
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Granted: 1952-12-16
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Expires: 1970-09-07
Abstract
No abstract record available.
Inventors
- 👤 Bertele Ludwig Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:49
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1468762A
Cited
US1478704A
Cited
DE461062C
Cited
GB409465A
Cited
US2267832A
Cited
US2423676A
Cited
CH248246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |