US2528946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of modified alkyd resins and products
Assignee: Sherwin Williams Co
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Filing: 1947-11-19
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Granted: 1950-11-07
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Expires: 1967-11-19
Abstract
No abstract record available.
Inventors
- 👤 Coffey Charles Adams
- 👤 William T Walton
- 👤 Britan Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/46; C08G63/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD FOR DEHYDRATING CASTOR OIL AND FORMING THEREWITH AN OIL MODIFIED ALKYD RESIN WHICH COMPRISES SUBSTANTIALLY DEHYDRATING THE CASTOR OIL IN THE PRESENCE OF PHTHALIC ANHYDRIDE AND GLYCERINE, DEHYDRATING AS THE PRIMARY REACTION WITHIN A TEMPERATURE RANGE OF FROM 260 TO 300 DEGREES C., WHEREIN THE MOLAR RATIO OF GLYCERINE TO THE OIL IS NOT MORE THAN 1.5:1 AND NOT LESS THAN 2:3 UNTIL THE OIL IS DEHYDRATED AND SUBSEQUENTLY LOWERING THE TEMPERATURE, PARTLY BY ADDITION OF A POLYHYDRIC ALCOHOL, DURING A SECONDARY PHASE TO A RANGE WITHIN 220 TO 250 DEGREES C. WHEREUPON THE REACTION BECOMES PREDOMINANTLY ONE OF ESTERIFICATION, AND HOLDING THE TEMPERATURE WITHIN THE LOWERED RANGE UNTIL A CLEAR, HOMOGENEOUS DEHYDRATED CASTOR OIL MODIFIED ALKYD RESIN HAS FORMED.
Claim 2
Independent Claim
122 words
A METHOD FOR DEHYDRATING CASTOR OIL AND FORMING THEREWITH AN OIL MODIFIED ALKYD RESIN WHICH COMPRISES SUBSTANTIALLY DEHYDRATING THE CASTOR OIL IN THE PRESENCE OF PHTHALIC ANHYDRIDE AND GLYCERINE, DEHYDRATING AS THE PRIMARY REACTION WITHIN A TEMPERATURE RANGE OF FROM 260 TO 300 DEGREES C., WHEREIN THE MOLAR RATIO OF GLYCERINE TO THE OIL IS NOT MORE THAN 1.5:1 AND NOT LESS THAN 2:3 UNTIL THE OIL IS DEHYDRATED AND SUBSEQUENTLY LOWERING THE TEMPERATURE, PARTLY BY ADDITION OF A POLYHYDRIC ALCOHOL, DURING A SECONDARY PHASE TO A RANGE WITHIN 220 TO 250 DEGREES C. WHEREUPON THE REACTION BECOMES PREDOMINANTLY ONE OF ESTERIFICATION, AND HOLDING THE TEMPERATURE WITHIN THE LOWERED RANGE UNTIL A CLEAR, HOMOGENEOUS DEHYDRATED CASTOR OIL MODIFIED ALKYD RESIN HAS FORMED.
References Cited (Backward Citations)
GB431495A
Cited
US2319022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |