Patent US1207262A successfully refreshed from Google Patents.
Patent US3897394A successfully refreshed from Google Patents.
US3897394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybisphenols
Assignee: Dow Chemical Co
•
Filing: 1974-07-01
•
Granted: 1975-07-29
•
Expires: 1994-07-01
Abstract
Abstract Polybisphenols having recurring units of the structure WHEREIN A is a divalent hydrocarbon group of 1-13 carbons, R1 and R2 are independently selected from hydrogen, halogen, alkoxy, or alkyl groups wherein the alkoxy or alkyl groups have 1-3 carbon atoms and the sum of p and q is 0-4.
Inventors
- 👤 William Ross Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:40
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44; C08G61/00; C08G61/02; C08L; C08L63/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
8 words
POLYBISPHENOLS HAVING RECURRING UNITS OF THE FOLLOWING STRUCTURE,
Claim 2
Dependent Claim
8 words
POLYBISPHENOLS HAVING RECURRING UNITS OF THE FOLLOWING STRUCTURE,
Claim 3
Dependent Claim
6 words
Oligomeric polybisphenols according to claim 1.
Claim 4
Dependent Claim
7 words
Fiber forming polybisphenols according to claim 1.
Claim 5
Dependent Claim
10 words
Thermoplastic polybisphenols produced by reacting a bisphenol having the structure
Claim 6
Dependent Claim
10 words
Thermoplastic polybisphenols produced by reacting a bisphenol having the structure
Claim 7
Dependent Claim
73 words
Thermoplastic polybisphenols produced as set forth in claim 4 wherein the oxygen containing gas used is sufficient to give an oxygen-bisphenol mol range of about 0.1:1 to about 50:1, wherein the amount of cuprous salt used is sufficient to give a cuprous salt-bisphenol mol range of about 0.1:1 to about 1.0:1 and wherein the amount of tertiary amine used is sufficient to give an amine-bisphenol mol range of about 0.5:1 to about 50:1.
Claim 8
Dependent Claim
14 words
Thermoplastic polybisphenols as set forth in claim 4 wherein the bisphenol used is 2,2-bis(4-hydroxyphenyl)propane.
Claim 9
Dependent Claim
14 words
Thermoplastic polybisphenols as set forth in claim 5 wherein the bisphenol used is 2,2-bis(4-hydroxyphenyl)propane.
Claim 10
Dependent Claim
11 words
Polybisphenols having a majority of recurring units of the following structures,
Claim 11
Dependent Claim
11 words
Polybisphenols having a majority of recurring units of the following structures,
Claim 12
Dependent Claim
6 words
Oligomeric polybisphenols according to claim 8.
Claim 13
Dependent Claim
7 words
Fiber forming polybisphenols according to claim 8.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |