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US1667249A
Expired / Lapsed
US
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Apparatus for comparing the color of liquids by reflected and transmitted light
Assignee: BDH Chemicals Ltd
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Filing: 1925-02-25
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Granted: 1928-04-24
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Expires: 1945-02-25
Abstract
No abstract record available.
Inventors
- 👤 Ellis Henry Augustus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/29; G01N21/293
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) | 1931-04-24 | 1931-10-24 | 1932-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-04-24 | 1935-10-24 | 1936-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-04-24 | 1939-10-24 | 1940-04-24 | $7700.00 | Window Closed / Lapsed |