US2578624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-component lens system of the petzval type
Assignee: Individual
•
Filing: 1949-05-03
•
Granted: 1951-12-11
•
Expires: 1969-05-03
Abstract
No abstract record available.
Inventors
- 👤 Back Frank Gerard
- 👤 Lowen Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:40
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US65729A
Cited
US886416A
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US1610514A
Cited
US1797202A
Cited
US1899069A
Cited
US1913389A
Cited
US2164028A
Cited
US2158202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |