US3100796A
Expired / Lapsed
US
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Method for making ar-poly(hydroxymethyl)diphenyl ethers
Assignee: Dow Chemical Co
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Filing: 1960-04-04
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Granted: 1963-08-13
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Walter B Trapp
- 👤 James D Doedens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:10
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/18; C07C41/26; C07C43/00; C07C43/02; C07C43/257; C07C43/295; C08; C08G; C08G63/00; C08G63/66
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
METHOD FOR MAKING AR-POLY(HYDROXYMETHYL) DIPHENYL ETHERS HAVING UP TO 4 HYDROXYMETHYL GROUPS PER MOLE BY HYDROLYSIS AT A TEMPERATURE BETWEEN ABOUT 75* AND 110*C. OF AR-POLY(ACETOXYMETHYL) DIPHENYL ETHERS HAVING UP TO 4 ACETOXY GROUPS PER MOLE, UP TO 2 OF WHICH ARE ON ONE BENZENE NUCLEUS WITH A STOICHIOMETRIC EXCESS OF AN ALKALI METAL HYDROXIDE FOR A TIME SUFFICIENT TO DISPLACE ACETOXYMETHYL GROUPS AND TO REPLACE THEM WITH HYDROCYL GROUPS AND SEPARATING THE AR-POLY(HYDROXYMETHYL) DIPHENYL ETHER PRODUCT FROM THE REACTION MEDIUM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |