US2870131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density polyethylene by high pressure polymerization with hydrogen and azo catalyst
Assignee: Eastman Kodak Co
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Filing: 1956-06-12
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Granted: 1959-01-20
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Expires: 1976-06-12
Abstract
No abstract record available.
Inventors
- 👤 James E Guillet
- 👤 Jr Harry W Coover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:45
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF POLYMERIZING ETHYLENE TO FORM AN IMPROVED SOLID ETHYLENE HOMOPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 20,000, A DENSITY ABOVE 0.930 AND A STIFFNESS OF AT LEAST 25,000 P. S. I. WHICH COMPRISES POLYMERIZING ETHYLENE AT A TEMPERATURE OF 80180* C. AND A PRESSURE OF 10,000-50,000 P. S. I. IN THE PRESENCE OF AN AZO CATALYST FOR ETHYLENE POLYMERIZATION AND FROM 0.01 TO 5% BY WEIGHT OF HYDROGEN BASED ON SAID ETHYLENE.
Claim 2
Independent Claim
76 words
THE METHOD OF POLYMERIZING ETHYLENE TO FORM AN IMPROVED SOLID ETHYLENE HOMOPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 20,000, A DENSITY ABOVE 0.930 AND A STIFFNESS OF AT LEAST 25,000 P. S. I. WHICH COMPRISES POLYMERIZING ETHYLENE AT A TEMPERATURE OF 80180* C. AND A PRESSURE OF 10,000-50,000 P. S. I. IN THE PRESENCE OF AN AZO CATALYST FOR ETHYLENE POLYMERIZATION AND FROM 0.01 TO 5% BY WEIGHT OF HYDROGEN BASED ON SAID ETHYLENE.
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |