Patent US970932A successfully refreshed from Google Patents.
Patent US3208983A successfully refreshed from Google Patents.
US3208983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isopropenylpyridine polymers having a high steric regularity and a high softening temperature and method for preparing same
Assignee: Montedison SpA
•
Filing: 1961-07-17
•
Granted: 1965-09-28
•
Expires: 1981-07-17
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Mazzanti Giorgio
- 👤 Sempio Carlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:03
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L39/00; C08L39/04; C08L39/08; Y; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
A LINEAR HEAD-TO-TAIL HOMOPOLYMER OF 4-ISOPROPENYLPYRIDINE CHARACTERIZED BY HAVING A SOFTENING TEMPERATURE OF FROM ABOUT 200*C. TO 240*C., AND BY BEING INSOLUBLE IN BOILING ACETONE, SAID POLYMER BEING PRODUCED ACCORDING TO CLAIM 3.
Claim 2
Dependent Claim
126 words
A PROCESS FOR PREPARING A LINEAR, HEAD-TO-TAIL HOMOPOLYMER OF AN ISOPROPENYLPYRIDINE SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF 2-ISOPROPENYLPYRIDINE HAVING A SOFTENING TEMPERATURE OF ABOUT 190*C. TO 220*C., AND HOMOPOLYMERS OF 4-ISOPROPENYLPYRIDINE HAVING A SOFTENING TEMPERATURE OF ABOUT 200*C. TO 240* C., WHICH PROCESS COMPRISES POLYMERIZING THE SELECTED MONOMERIC ISOPROPENYLPYRIDINE AT A TEMPERATURE OF FROM ABOUT 0*C. TO 100*C., IN AN INERT ATMOSPHERE, AND IN CONTACT WITH A CATALYST CONSISTING OF A METAL COMPOUND WHEREIN THE METAL IS ONE BEYONGING TO GROUPS I TO III INCLUSIVE OF THE MENDELEEF PERIODIC TABLE, SAID CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF THE FOLLOWING COMPOUNDS: DIETHYL AMINO MAGNESIUM BROMIDE PHENYL MAGNESIUM BROMIDE N-BUTYL LITHIUM BERYLLIUM DIETHYL MAGNESIUM DIETHYL N-CARBAMYL LITHIUM BERYLLIUM-BIS-(DIMETHYLAMINE) PHENYLMETHYLAMINO MAGNESIUM BROMIDE LIAL(N(C3H5)2)3H AND LIAL(N(C6H5)2)2H.O(C2H5)2
Claim 3
Dependent Claim
126 words
A PROCESS FOR PREPARING A LINEAR, HEAD-TO-TAIL HOMOPOLYMER OF AN ISOPROPENYLPYRIDINE SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF 2-ISOPROPENYLPYRIDINE HAVING A SOFTENING TEMPERATURE OF ABOUT 190*C. TO 220*C., AND HOMOPOLYMERS OF 4-ISOPROPENYLPYRIDINE HAVING A SOFTENING TEMPERATURE OF ABOUT 200*C. TO 240* C., WHICH PROCESS COMPRISES POLYMERIZING THE SELECTED MONOMERIC ISOPROPENYLPYRIDINE AT A TEMPERATURE OF FROM ABOUT 0*C. TO 100*C., IN AN INERT ATMOSPHERE, AND IN CONTACT WITH A CATALYST CONSISTING OF A METAL COMPOUND WHEREIN THE METAL IS ONE BEYONGING TO GROUPS I TO III INCLUSIVE OF THE MENDELEEF PERIODIC TABLE, SAID CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF THE FOLLOWING COMPOUNDS: DIETHYL AMINO MAGNESIUM BROMIDE PHENYL MAGNESIUM BROMIDE N-BUTYL LITHIUM BERYLLIUM DIETHYL MAGNESIUM DIETHYL N-CARBAMYL LITHIUM BERYLLIUM-BIS-(DIMETHYLAMINE) PHENYLMETHYLAMINO MAGNESIUM BROMIDE LIAL(N(C3H5)2)3H AND LIAL(N(C6H5)2)2H.O(C2H5)2
References Cited (Backward Citations)
US2861902A
Cited
US2846427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |