Patent US4772832A successfully refreshed from Google Patents.
Patent US2452385A successfully refreshed from Google Patents.
US2452385A
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Color comparison apparatus
Assignee: Individual
•
Filing: 1943-12-30
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Granted: 1948-10-26
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Expires: 1963-12-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Merckel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/29; G01N21/293; Y; Y10; Y10S; Y10S116/00; Y10S116/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US431132A
Cited
US639350A
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US665468A
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US1052991A
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US1164555A
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US1386571A
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US1986403A
Cited
US2009943A
Cited
US2346261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |