US2449259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Schmidt type optical system with parallel plate refractive element
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-04-18
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Granted: 1948-09-14
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Expires: 1966-04-18
Abstract
No abstract record available.
Inventors
- 👤 Pieter Martinus Van Alphen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:50
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888; G02B27/00; G02B27/0025; G02B27/0068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2031792A
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US2170979A
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US2258903A
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US2309788A
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GB544694A
Cited
US2298808A
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US2305855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |