US3734890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to produce oilless alkyds
Assignee: Celanese Corp
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Filing: 1971-04-08
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Granted: 1973-05-22
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Expires: 1991-04-08
Abstract
Abstract AN IMPROVED PROCESS FOR PRODUCING AN OILLESS ALKYD CAPABLE OF PROVIDING SUPERIOR COATING COMPOSITIONS WHICH COMPRISES PRODUCING AN INTERPOLYMER, BEING SUBSTANTIALLY FREE OF GELATION BY THE REACTION OF A POLYOL HAVING 3 T 4 HYDROXYL FUNCTIONAL GROUPS, AN ALIPHATIC DIOL HAVING 5 TO 7 CARBON ATOMS AND A PHTHALIC ANHYDRIDE COMPONENT IN THE PRESENCE OF A CATALYTIC AMOUNT OF DIALKYL STANNIC OXIDE WHEREIN EACH ALKYL GROUP CAN CONTAIN FROM 1 TO 6 CARBON ATOMS.
Inventors
- 👤 T Powanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:34
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/02; C08G63/12; C08G63/16; C08G63/20
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |