US3828006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters prepared from bisphenols and isopropylidene bis(p-phenyleneoxy)diacetyl chloride
Assignee: Dow Chemical Co
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Filing: 1973-08-06
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Granted: 1974-08-06
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Expires: 1993-08-06
Abstract
Abstract BISPHENOL AND HALOGENATED BISPHENOL POLYESTERS OF BISACID A2 CAN BE MOLDED INTO HARD TRANSPARENT SOLID ARTICLES. THE POLYESTERS ARE READILY MADE BY REACTING THE BISACID CHLORIDE WITH THE BISPHENOL IN AN ORGANIC SOLVENT SOLUTION AND IN THE PRESENCE OF AN HCL SCAVENGER.
Inventors
- 👤 R Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:27
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
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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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |