US3256259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers of reduced molecular weight
Assignee: ExxonMobil Oil Corp
•
Filing: 1963-03-08
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Granted: 1966-06-14
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Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
- 👤 Francis M Seger
- 👤 Victor C Serreze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:49
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/905; Y10S526/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A CATALYST SYSTEM FOR PRODUCING CRYSTALLINE LINEAR POLYETHYLENE AND TACTIC POLYMERS OF ALPHA-OLEFINS THAT IS PREPARED BY COMBINING (A) A COMPOUND OF A TRANSITIONAL METAL AND (B) AN ORGANOMETALLIC COMPOUND, AND TREATING WITH HYDROGEN, IN AN AMOUNT VARYING BETWEEN ABOUT ONE MOLE AND ABOUT 8 MOLES PER MOLE OF SAID COMPOUND OF A TRANSITIONAL METAL, IN THE ABSENCE OF OLEFIN MONOMER, AT A TEMPERATURE OF BETWEEN ABOUT 20*C. AND ABOUT 77*C., AND FOR A PERIOD OF TIME BETWEEN ABOUT 5 MINUTES AND ABOUT ONE HOUR; SAID COMPOUND OF A TRANSITIONAL METAL BEING A COMPOUND OF A METAL OF GROUPS IV-A, V-A, VI-A, AND VIII OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS WHEREIN THE METAL IS PRESENT IN A VALENCE STATE LOWER THAN ITS MAXIMUM; SAID ORGANOMETALLIC COMPOUND BEING A COMPOUND OF A METAL OF GROUPS II AND III OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS; AND THE MOLAR RATIO OF (B) TO (A) BEING BETWEEN ABOUT 0.1 AND ABOUT 20.
Claim 2
Dependent Claim
160 words
A CATALYST SYSTEM FOR PRODUCING CRYSTALLINE LINEAR POLYETHYLENE AND TACTIC POLYMERS OF ALPHA-OLEFINS THAT IS PREPARED BY COMBINING (A) A COMPOUND OF A TRANSITIONAL METAL AND (B) AN ORGANOMETALLIC COMPOUND, AND TREATING WITH HYDROGEN, IN AN AMOUNT VARYING BETWEEN ABOUT ONE MOLE AND ABOUT 8 MOLES PER MOLE OF SAID COMPOUND OF A TRANSITIONAL METAL, IN THE ABSENCE OF OLEFIN MONOMER, AT A TEMPERATURE OF BETWEEN ABOUT 20*C. AND ABOUT 77*C., AND FOR A PERIOD OF TIME BETWEEN ABOUT 5 MINUTES AND ABOUT ONE HOUR; SAID COMPOUND OF A TRANSITIONAL METAL BEING A COMPOUND OF A METAL OF GROUPS IV-A, V-A, VI-A, AND VIII OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS WHEREIN THE METAL IS PRESENT IN A VALENCE STATE LOWER THAN ITS MAXIMUM; SAID ORGANOMETALLIC COMPOUND BEING A COMPOUND OF A METAL OF GROUPS II AND III OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS; AND THE MOLAR RATIO OF (B) TO (A) BEING BETWEEN ABOUT 0.1 AND ABOUT 20.
References Cited (Backward Citations)
US3051690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |