Patent US2832257A successfully refreshed from Google Patents.
US2832257A
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Exposure head for photoelectric colorimeters
Assignee: HENRY A GARDNER LAB Inc
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Filing: 1954-04-13
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Granted: 1958-04-29
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Expires: 1974-04-13
Abstract
No abstract record available.
Inventors
- 👤 Richard S Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:59
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/51; G01J3/02; G01J3/10; G01J3/513
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2073223A
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US2273356A
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US2375889A
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US2406166A
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US2483102A
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US2574264A
Cited
US2649013A
Cited
US2739246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |