Patent US1627985A successfully refreshed from Google Patents.
Patent US3261889A successfully refreshed from Google Patents.
US3261889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene-containing material having an increased resistance to environmental stress cracking
Assignee: Stamicarbon BV
•
Filing: 1965-09-08
•
Granted: 1966-07-19
•
Expires: 1985-09-08
Abstract
No abstract record available.
Inventors
- 👤 Johan W F Van T Wout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:05
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08L23/16; C08L23/18; C08L23/20; C08L23/22; C08L2314/00; C08L2314/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1397
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD OF PREPARING A POLYETHYLENE-CONTAINING MATERIAL HAVING AN INCREASED RESISTANCE TO ENVIRONMENTAL STRESS CRACKING, COMPRISING THE STEP OF: ADDING TO 100 PARTS BY WEIGHT OF HIGH PRESSURE POLYETHYLENE, 3-30 PARTS BY WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF ATACTIC COPOLYMERS OF ETHYLENE AND PROPYLENE; ATACTIC COPOLYMERS OF ETHYLENE AND BUTENE-1, AND MIXTURES THEREOF, SAID ATTACTIC COPOLYMER BEING FORMED IN THE PRESENCE OF A CATALYST FORMED BY ADDING AT LEAST ONE COMPOUND OF A METAL OF THE GROUPS 4-8, INCLUSIVE, OF THE PERIODIC SYSTEM TO A COMPOUND SELECTED FROM THE GROUP CONSISTING OFA METAL, AN ALLOY, A METAL HYDRIDE, AND AN ORGANO-METALLIC COMPOUND OF THE GROUPS 1-3, INCLUSIVE, OF THE PERIODIC SYSTEM.
Claim 2
Independent Claim
114 words
A METHOD OF PREPARING A POLYETHYLENE-CONTAINING MATERIAL HAVING AN INCREASED RESISTANCE TO ENVIRONMENTAL STRESS CRACKING, COMPRISING THE STEP OF: ADDING TO 100 PARTS BY WEIGHT OF HIGH PRESSURE POLYETHYLENE, 3-30 PARTS BY WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF ATACTIC COPOLYMERS OF ETHYLENE AND PROPYLENE; ATACTIC COPOLYMERS OF ETHYLENE AND BUTENE-1, AND MIXTURES THEREOF, SAID ATTACTIC COPOLYMER BEING FORMED IN THE PRESENCE OF A CATALYST FORMED BY ADDING AT LEAST ONE COMPOUND OF A METAL OF THE GROUPS 4-8, INCLUSIVE, OF THE PERIODIC SYSTEM TO A COMPOUND SELECTED FROM THE GROUP CONSISTING OFA METAL, AN ALLOY, A METAL HYDRIDE, AND AN ORGANO-METALLIC COMPOUND OF THE GROUPS 1-3, INCLUSIVE, OF THE PERIODIC SYSTEM.
References Cited (Backward Citations)
US3036987A
Cited
US3176052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |