Patent US2558302A successfully refreshed from Google Patents.
US2558302A
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Powdered transparent iron oxide pigments
Assignee: Wyeth Holdings LLC
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Filing: 1947-08-07
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Granted: 1951-06-26
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Expires: 1967-08-07
Abstract
No abstract record available.
Inventors
- 👤 Guy C Marcot
- 👤 Winfred J Cauwenberg
- 👤 Stephen A Lamanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:27
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/22; C09C1/24; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2002/00; C01P2002/02; C01P2002/80; C01P2002/84; C01P2004/00; C01P2004/60; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
AN IRON OXIDE PIGMENT IN THE FORM OF A POWDER CONTAINING NOT MORE THAN ABOUT 5-7% OF FREE MOISTURE AND HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 0.1 MICRON IN MAXIMUM DIAMETER, SAID POWDER CONSISTING ESSENTIALLY OF DISCRETE PARTICLES OF CRYSTALLINE FERRIC OXIDE CONTAINING LESS THAN 1% OF THEIR WEIGHT OF A MEMBER OF THE GROUP AGGLOMERATION BY A COATING OF FROM 10% TO ABOUT 100% OF THEIR WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF ORGANIC CARBOXYLIC ACIDS OF 10-22 CARBON ATOMS AND HIGH ACID NUMBER ESTERS CONTAINING THESE ACIDS, SAID PIGMENT BEING CHARACTERIZED BY A VISIBILITY VALUE.
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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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |