US2739246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure head for photometric comparator instruments
Assignee: HENRY A GARDNER LAB Inc
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Filing: 1950-06-08
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Granted: 1956-03-20
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Expires: 1970-06-08
Abstract
No abstract record available.
Inventors
- 👤 Richard S Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55; G01N21/57; G01N21/25; G01N21/27; G01N21/274
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2445041A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |