US3592874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated polyesters containing chemically incorporated cobalt
Assignee: CHEMISCHE WERKE AG
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Filing: 1968-08-30
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Granted: 1971-07-13
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Expires: 1988-08-30
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF A HARDENABLE POLYESTER COMPOSITION BY (A) TRANSESTERIFYING HIGH MOLECULAR WEIGHT POLYESTERS OF ISOPHTHALIC OR TEREPHTHALIC ACID OR OF BOTH ACIDS WITH A POLYHYDRIC ALCOHOL IN THE PRESENCE OF A COBALT SALT AND CHEMICALLY BUILDING IN THE COLBALT INTO THE POLYESTER, (B) FURTHER ESTERIFYING THE PRODUCT OF (A) WITH UNITS OF AN UNSATURATED POLYCARBOXYLIC ACID OR A MIXTURE THEREOF WITH AN ALCOHOL AND (C) ADMIXING THE PRODUCT OF (B) WITH AN UNSATURATED COPOLYMERIZABLE MONOMER TO YIELD A COMPOSITION HARDENABLE BY A PEROXIDE CATALYST WITHOUT THE FURTHER ADDITION OF AN ACCELERATOR.
Inventors
- 👤 Johannes Reese
- 👤 Hermann Hotze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:44
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/681
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |