Patent US2249833A successfully refreshed from Google Patents.
US2249833A
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US
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Optical system for exposure meters
Assignee: De Jur AMSCO Corp
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Filing: 1940-02-26
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Granted: 1941-07-22
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Expires: 1960-02-26
Abstract
No abstract record available.
Inventors
- 👤 James Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:22
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J1/06; G01J1/42; G01J1/4228; G01J1/0204; G01J1/0233; G01J1/0271
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-21 | 1945-01-20 | 1945-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-21 | 1949-01-20 | 1949-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-21 | 1953-01-20 | 1953-07-22 | $7700.00 | Window Closed / Lapsed |