US3316233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and catalyst for the polymerization of ethylenic monomers
Assignee: Dow Chemical Co
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Filing: 1962-08-08
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Granted: 1967-04-25
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Expires: 1982-08-08
Abstract
No abstract record available.
Inventors
- 👤 Darrell C Feay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:22
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/28; C01; C01B; C01B23/00; C06; C06B; C06B47/00; C06B47/02; C06B47/10; C08; C08F; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639; C08F4/63904; C08F4/64; C08F4/659; C08F4/6592; C08F4/65922; C08F4/65925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A METHOD OF MAKING HIGHLY STEREOREGULAR POLYPROPYLENE BY POLYMERIZING ESSENTIALLY PROPYLENE AT A POLYMERIZATION TEMPERATURE IN THE RANGE FROM ABOUT 120* TO ABOUT 150*C. IN A REACTION MIXTURE COMPRISING DRY XYLENE AND A POLYMERIZATION CATALYST MIXTURE CONSISTING ESSENTIALLY OF A-TITANIUM TRICHLORIDE AND A RED COMPOUND OF THE FORMULA
Claim 2
Independent Claim
48 words
A METHOD OF MAKING HIGHLY STEREOREGULAR POLYPROPYLENE BY POLYMERIZING ESSENTIALLY PROPYLENE AT A POLYMERIZATION TEMPERATURE IN THE RANGE FROM ABOUT 120* TO ABOUT 150*C. IN A REACTION MIXTURE COMPRISING DRY XYLENE AND A POLYMERIZATION CATALYST MIXTURE CONSISTING ESSENTIALLY OF A-TITANIUM TRICHLORIDE AND A RED COMPOUND OF THE FORMULA
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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |