Patent US2938020A successfully refreshed from Google Patents.
US2938020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerization of olefins
Assignee: Hercules Powder Co
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Filing: 1957-05-27
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Granted: 1960-05-24
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Expires: 1977-05-27
Abstract
No abstract record available.
Inventors
- 👤 Albert S Matlack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:54
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/906; Y10S526/912
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE PROCESS OF POLYMERIZING A 1-OLEFIN WHICH COMPRISES CONTACTING SAID OLEFIN WITH A MIXTURE OF FROM ABOUT 0.05% TO ABOUT 100%, BASED ON THE WEIGHT OF OLEFIN, OF A HALOALKANE AND A FINELY DIVIDED METAL HAVING A FRESHLY EXPOSED SURFACE AND A PARTICLE SIZE OF FROM ABOUT 1 MICRON TO ABOUT 100 MICRONS, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS IV-B, V-B, VI-B AND VII-B OF THE MENDELEEV PERIODIC TABLE, AND SAID HALOALKANE HAVING THE FORMULA R1R2R3CX WHERE X IS HALOGEN AND R1, R2 AND R3 ARE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, AND HALOALKYL.
Claim 2
Dependent Claim
103 words
THE PROCESS OF POLYMERIZING A 1-OLEFIN WHICH COMPRISES CONTACTING SAID OLEFIN WITH A MIXTURE OF FROM ABOUT 0.05% TO ABOUT 100%, BASED ON THE WEIGHT OF OLEFIN, OF A HALOALKANE AND A FINELY DIVIDED METAL HAVING A FRESHLY EXPOSED SURFACE AND A PARTICLE SIZE OF FROM ABOUT 1 MICRON TO ABOUT 100 MICRONS, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS IV-B, V-B, VI-B AND VII-B OF THE MENDELEEV PERIODIC TABLE, AND SAID HALOALKANE HAVING THE FORMULA R1R2R3CX WHERE X IS HALOGEN AND R1, R2 AND R3 ARE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, AND HALOALKYL.
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) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |