US2552795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic pigments
Assignee: Harshaw Chemical Co
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Filing: 1949-01-17
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Granted: 1951-05-15
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Expires: 1969-01-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Burnham W King
- 👤 Adolph O Tesar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:39
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/122; C03C10/00; C03C10/0054; C09; C09C; C09C1/00; C09C1/0009; C01; C01P; C01P2002/00; C01P2002/80; C01P2002/84; C01P2006/00; C01P2006/32; C01P2006/37; C01P2006/60; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A FIRED, COMPOSITE, YELLOW PIGMENT COMPRISING PRINCIPALLY LEAD ANTIMONATE SAID LEAD ANTIMONATE BEING MODIFIED WITH MINOR PROPORTIONS OF CERIUM AND ALUMINUM OXIDES AND HAVING IMPROVED PROPERTIES OF HEAT STABILITY AS COMPARED WITH UNMODIFIED LEAD ANTIMONATE, BEING THE CALCINATION PRODUCT OF OXIDES OF LEAD, ANTIMONY, ALUMINUM, AND CERIUM AND CONTAINING ON THE ANALYTICAL BASIS CERIUM OXIDE TO THE EXTENT OF FROM 1% TO 15% AND ALUMINUM OXIDE TO THE EXTENT OF FROM 1.5% TO 15%, PERCENTAGES BY WEIGHT BASED UPON THE COMBINED WEIGHTS OF LEAD, ANTIMONY, CERIUM AND ALUMINUM OXIDE.
Claim 2
Dependent Claim
89 words
A FIRED, COMPOSITE, YELLOW PIGMENT COMPRISING PRINCIPALLY LEAD ANTIMONATE SAID LEAD ANTIMONATE BEING MODIFIED WITH MINOR PROPORTIONS OF CERIUM AND ALUMINUM OXIDES AND HAVING IMPROVED PROPERTIES OF HEAT STABILITY AS COMPARED WITH UNMODIFIED LEAD ANTIMONATE, BEING THE CALCINATION PRODUCT OF OXIDES OF LEAD, ANTIMONY, ALUMINUM, AND CERIUM AND CONTAINING ON THE ANALYTICAL BASIS CERIUM OXIDE TO THE EXTENT OF FROM 1% TO 15% AND ALUMINUM OXIDE TO THE EXTENT OF FROM 1.5% TO 15%, PERCENTAGES BY WEIGHT BASED UPON THE COMBINED WEIGHTS OF LEAD, ANTIMONY, CERIUM AND ALUMINUM OXIDE.
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |