US3824211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of 4,4'-hexafluoroisopropylidene diphenol
Assignee: Individual
•
Filing: 1972-07-06
•
Granted: 1974-07-16
•
Expires: 1992-07-06
Abstract
Abstract RELATES TO A UNIQUE THERMALLY STABLE POLYMER THAT US PARTICULATE USEUL IN PROTECTIVE COATING COMPOSITIONS AND PAINTS SYSTEMS. THE POLYMER IS PREPARED BY AN INTERFACIAL POLYMERIZATION PROCESS AT ROOM TEMPERATURE WHEREIN HEXAFLUOROACETONE BISPHENOL A IS MIXED IN ONE PHASE AMD ISO AND/OR TEREPHTHALOYL CHLORIDE IS MIXED IN THE OTHER PHASE IN THE PRESENCE OF A SUITABLE TERMINATOR. VARIOUS PROPORTIONS OF THE HEXAFLUOROACETONE BISPHENOL A AND THE PHTHALOLY CHLORIDE OPTIONALLY REPLACED BY VARIOUS SPECIFIED DIFUNCTIONAL INTERMEDIATES.
Inventors
- 👤 W Howerton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:03
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; 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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |