US3666736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low density ethylene-butene copolymers
Assignee: Phillips Petroleum Co
•
Filing: 1969-03-24
•
Granted: 1972-05-30
•
Expires: 1989-03-24
Abstract
Abstract Low density ethylene-butene-1 copolymers which are highly resistant to environmental stress cracking, characterized by freedom from surface stickiness, and have a ratio of weight average to number average molecular weight within the range of 6 to 20.
Inventors
- 👤 John P Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:55
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
The copolymer of claim 1 having an environmental stress cracking resistance (F50) of greater than 1,000.
Claim 2
Dependent Claim
15 words
The copolymer of claim 2 having a density within the range of 0.923 to 0.927.
References Cited (Backward Citations)
US3067184A
Cited
US2980659A
Cited
US3174957A
Cited
US3242150A
Cited
US3130188A
Cited
US3177184A
Cited
US3227699A
Cited
US3349067A
Cited
US3288767A
Cited
US3562241A
Cited
US3445367A
Cited
US3446754A
Cited
US3509116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |