Patent US3845028A successfully refreshed from Google Patents.
US3845028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing molecular weight of polymer
Assignee: Individual
•
Filing: 1972-12-04
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Granted: 1974-10-29
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Expires: 1992-12-04
Abstract
Abstract 1. THE PROCESS OF INCREASING THE MOLECULAR WEIGHT OF A POLYMER OF THE CLASS CONSISTING OF TERMINALLY LITHIATED HOMOPOLYMERS OF CONJUGATED DIENES CONTAINING 4 TO 6 CARBON ATOMS AND TERMINALLY LITHIATED COPOLYMERS OF SUCH CONJUGATED DIENES AND A VINYL MONOMER, WHICH COMPRISES JOINING THE UNITS OF THE POLYMER WITH SUBSTANTIALLY EQUIMOLAR AMOUNTS OF TUNGSTEN HEXACHLORIDE AND TRIISOBUTYLALUMINUM WHICH CAUSES JOINING THE POLYMER AND PRODUCTION OF A POLYMER OF INCREASED MOLECULAR WEIGHT.
Inventors
- 👤 A Halasa
- 👤 T Bethea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:08
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE PROCESS OF INCREASING THE MOLECULAR WEIGHT OF A POLYMER OF THE CLASS CONSISTING OF TERMINALLY LITHIATED HOMOPOLYMERS OF CONJUGATED DIENES CONTAINING 4 TO 6 CARBON ATOMS AND TERMINALLY LITHIATED COPOLYMERS OF SUCH CONJUGATED DIENES AND A VINYL MONOMER, WHICH COMPRISES JOINING THE UNITS OF THE POLYMER WITH SUBSTANTIALLY EQUIMOLAR AMOUNTS OF TUNGSTEN HEXACHLORIDE AND TRIISOBUTYLALUMINUM WHICH CAUSES JOINING THE POLYMER AND PRODUCTION OF A POLYMER OF INCREASED MOLECULAR WEIGHT.
Claim 2
Dependent Claim
70 words
THE PROCESS OF INCREASING THE MOLECULAR WEIGHT OF A POLYMER OF THE CLASS CONSISTING OF TERMINALLY LITHIATED HOMOPOLYMERS OF CONJUGATED DIENES CONTAINING 4 TO 6 CARBON ATOMS AND TERMINALLY LITHIATED COPOLYMERS OF SUCH CONJUGATED DIENES AND A VINYL MONOMER, WHICH COMPRISES JOINING THE UNITS OF THE POLYMER WITH SUBSTANTIALLY EQUIMOLAR AMOUNTS OF TUNGSTEN HEXACHLORIDE AND TRIISOBUTYLALUMINUM WHICH CAUSES JOINING THE POLYMER AND PRODUCTION OF A POLYMER OF INCREASED MOLECULAR WEIGHT.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |