US2842532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of reducing the viscosity of polymers
Assignee: EIDP Inc
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Filing: 1956-10-23
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Granted: 1958-07-08
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Expires: 1976-10-23
Abstract
No abstract record available.
Inventors
- 👤 Tod W Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:38
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08F; C08F8/00; C08F8/50; C08F2810/00; C08F2810/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE PROCESS OF REDUCING THE INHERENT VISCOSITY OF CRYSTALLINE POLYMERS OF A BRANCHED CHAIN VINYL MONOMER HAVING THE FORMULA CH2=CH-R IN WHICH R IS A SATURATED HYDROCARBON GROUP OF FROM 3 TO 7 CARBON ATOMS IN WHICH BRANCHING OF THE CHAIN TAKES PLACE ON A CARBON ATOM NOT MORE THAN 2 REMOVED FROM THE VINYL RADICAL AND THE LONGEST STRAIGHT CHAIN IN THE MOLECULE DOES NOT EXCEED 7 CARBON ATOMS AND THE SAID POLYMER OR MIXTURES THEREOF HAVE AN INHERENT VISCOSITY ABOVE ABOUT 2 AND ARE REDUCED TO A VALUE WITHIN THE RANGE OF ABOUT 0.8 TO 1.6 WHICH COMPRISES THE STEPS OF CRACKING THE POLYMERIC MATERIAL BY SUBJECTING THE SAME TO A TEMPERATURE OF FROM ABOUT 250*C. TO 310*C. AND EXTRACTING THE GREASE PORTION FROM THEE POLYMER.
Claim 2
Dependent Claim
128 words
THE PROCESS OF REDUCING THE INHERENT VISCOSITY OF CRYSTALLINE POLYMERS OF A BRANCHED CHAIN VINYL MONOMER HAVING THE FORMULA CH2=CH-R IN WHICH R IS A SATURATED HYDROCARBON GROUP OF FROM 3 TO 7 CARBON ATOMS IN WHICH BRANCHING OF THE CHAIN TAKES PLACE ON A CARBON ATOM NOT MORE THAN 2 REMOVED FROM THE VINYL RADICAL AND THE LONGEST STRAIGHT CHAIN IN THE MOLECULE DOES NOT EXCEED 7 CARBON ATOMS AND THE SAID POLYMER OR MIXTURES THEREOF HAVE AN INHERENT VISCOSITY ABOVE ABOUT 2 AND ARE REDUCED TO A VALUE WITHIN THE RANGE OF ABOUT 0.8 TO 1.6 WHICH COMPRISES THE STEPS OF CRACKING THE POLYMERIC MATERIAL BY SUBJECTING THE SAME TO A TEMPERATURE OF FROM ABOUT 250*C. TO 310*C. AND EXTRACTING THE GREASE PORTION FROM THEE POLYMER.
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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |