Patent US3098060A successfully refreshed from Google Patents.
US3098060A
Expired / Lapsed
US
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Preparation of high molecular weight polyacrylonitrile with n-butyl lithium as catalyst
Assignee: Wyeth Holdings LLC
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Filing: 1960-05-27
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Granted: 1963-07-16
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Expires: 1980-05-27
Abstract
No abstract record available.
Inventors
- 👤 Mary L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:04
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD OF PRODUCING A WHITE HOMOPOLYMER OF ACRYLONITRILE HAVING A MOLECULAR WEIGHT OF AT LEAST 400,000 WHICH COMPRISES POLYMERIIZING DRY, OXYGEN-FREE ACRYLONITRILE MONOMER AT A TEMPERTURE OF FROM ABOUT -50*C. TO ABOUT -100*C. IN A SINGLE PHASE POLYMERIZATION SOLUTION CONSISTING ESSENTIALLY OF TOLUENE AND FROM ABOUT 0.01% TO ABOUT 1.0%, BY WEIGHT, BASED ON THE WEIGHT OF SAID MONOMER, OF BUTYL LITHIUM, SAID POLYMERIZATION BEING EFFECTED BY ADDING THE SAID ACRYLONITRILE MONOMER TO THE SAID TOLUENE-BUTYL LITHIUM SOLUTION.
Claim 2
Independent Claim
79 words
A METHOD OF PRODUCING A WHITE HOMOPOLYMER OF ACRYLONITRILE HAVING A MOLECULAR WEIGHT OF AT LEAST 400,000 WHICH COMPRISES POLYMERIIZING DRY, OXYGEN-FREE ACRYLONITRILE MONOMER AT A TEMPERTURE OF FROM ABOUT -50*C. TO ABOUT -100*C. IN A SINGLE PHASE POLYMERIZATION SOLUTION CONSISTING ESSENTIALLY OF TOLUENE AND FROM ABOUT 0.01% TO ABOUT 1.0%, BY WEIGHT, BASED ON THE WEIGHT OF SAID MONOMER, OF BUTYL LITHIUM, SAID POLYMERIZATION BEING EFFECTED BY ADDING THE SAID ACRYLONITRILE MONOMER TO THE SAID TOLUENE-BUTYL LITHIUM SOLUTION.
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) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |