US3364178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic poly (hydroxyalkyl diphenyl sulfone) ethers
Assignee: Shell USA Inc
•
Filing: 1964-12-21
•
Granted: 1968-01-16
•
Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Robert W F Kreps
- 👤 Klootwijk Arie
- 👤 Johan M Goppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:34
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC PRODUCTS WHICH COMPRISES DISSOLVING SUBSTANTIALLY EQUIMOLOR QUANTITIES OF REACTANTS CONSISTING OF A DIHYDRIC PHENOL AND A DIGLYCIDYL ETHER OF A DIHYDRIC PHENOL AT LEAST ONE OF SAID REACTANTS CONTAINING THE DIARYLSULFONE GROUP, TOGETHER WITH A CATALYTIC AMOUNT OF AN ALKALINE CATALYST, IN A NON-REACTIVE ORGAINIC SOLVENT HAVING A DIELECTRIC CONSTANT OF AT LEAST 5 AT THE REACTION TEMPERATURE AND CAPABLE OF KEEPING SAID REACTANTS IN SOLUTION AND MAINTAINING THE SOLUTION A AN ELEVATED TEMPERATURE OF AT LEAST 100*C. UNTIL A THERMOPLASTIC REACTION PRODUCT OF AT LEAST ABOUT 0.35 DL./G. INTRINISIC VISOSITY, MEASURED IN DIMETHYLFORMAMIDE, HAS BEEN FORMED.
Claim 2
Dependent Claim
104 words
A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC PRODUCTS WHICH COMPRISES DISSOLVING SUBSTANTIALLY EQUIMOLOR QUANTITIES OF REACTANTS CONSISTING OF A DIHYDRIC PHENOL AND A DIGLYCIDYL ETHER OF A DIHYDRIC PHENOL AT LEAST ONE OF SAID REACTANTS CONTAINING THE DIARYLSULFONE GROUP, TOGETHER WITH A CATALYTIC AMOUNT OF AN ALKALINE CATALYST, IN A NON-REACTIVE ORGAINIC SOLVENT HAVING A DIELECTRIC CONSTANT OF AT LEAST 5 AT THE REACTION TEMPERATURE AND CAPABLE OF KEEPING SAID REACTANTS IN SOLUTION AND MAINTAINING THE SOLUTION A AN ELEVATED TEMPERATURE OF AT LEAST 100*C. UNTIL A THERMOPLASTIC REACTION PRODUCT OF AT LEAST ABOUT 0.35 DL./G. INTRINISIC VISOSITY, MEASURED IN DIMETHYLFORMAMIDE, HAS BEEN FORMED.
Claim 3
Dependent Claim
14 words
A THERMOPLASTIC, SUBSTANTIALLY LINEAR POLYETHER CONTAINING AT LEAST PREDOMINANTLY RECURRING UNITS OF THE FORMULA
Claim 4
Dependent Claim
14 words
A THERMOPLASTIC, SUBSTANTIALLY LINEAR POLYETHER CONTAINING AT LEAST PREDOMINANTLY RECURRING UNITS OF THE FORMULA
References Cited (Backward Citations)
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Cited
US2592560A
Cited
US2602075A
Cited
US2945004A
Cited
US3044983A
Cited
US3305528A
Cited
US3177089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |