Patent US2546450A successfully refreshed from Google Patents.
US2546450A
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US
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Photometric comparator instrument
Assignee: HENRY A GARDNER LAB Inc
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Filing: 1949-02-23
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Granted: 1951-03-27
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Richard S Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:58
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55; G01N21/57
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2215211A
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US2423540A
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US2428806A
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US2471750A
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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) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |