Patent US3240774A successfully refreshed from Google Patents.
US3240774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the stiffness of high density polyethylene
Assignee: Eastman Kodak Co
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Filing: 1960-04-11
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Granted: 1966-03-15
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Expires: 1980-04-11
Abstract
No abstract record available.
Inventors
- 👤 Frederick B Joyner
- 👤 Jr Newton H Shearer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:34
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF INCREASING THE STIFFNESS OF HIGH DENSITY POLYETHYLENE WHICH COMPRISES POLYMERIZING ETHYLENE TO FORM A HIGH MOLECULAR WEIGHT POLYETHYLENE HAVING A DENSITY OF AT LEAST 0.94 IN THE PRESENCE OF A CATALYST COMPRISING A METAL ALKYL AND A TRANSITION ELEMENT COMPOUND AT A PRESSURE IN EXCESS OF 40 P.S.I.G., SEPARATING SAID POLYETHYLENE FROM THE POLYMERIZATON REACTION MIXTURE AND CONTACTING THE SEPARATED POLYETHYLENE WITH A NORMALLY LIQUID HYDORCARBON AT A TEMPERATURE IN THE RANGE OF ABOUT 40 TO ABOUT 95*C.
Claim 2
Independent Claim
81 words
THE METHOD OF INCREASING THE STIFFNESS OF HIGH DENSITY POLYETHYLENE WHICH COMPRISES POLYMERIZING ETHYLENE TO FORM A HIGH MOLECULAR WEIGHT POLYETHYLENE HAVING A DENSITY OF AT LEAST 0.94 IN THE PRESENCE OF A CATALYST COMPRISING A METAL ALKYL AND A TRANSITION ELEMENT COMPOUND AT A PRESSURE IN EXCESS OF 40 P.S.I.G., SEPARATING SAID POLYETHYLENE FROM THE POLYMERIZATON REACTION MIXTURE AND CONTACTING THE SEPARATED POLYETHYLENE WITH A NORMALLY LIQUID HYDORCARBON AT A TEMPERATURE IN THE RANGE OF ABOUT 40 TO ABOUT 95*C.
References Cited (Backward Citations)
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US2887473A
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US2887471A
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US2993881A
Cited
US2846427A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |