Patent US1883481A successfully refreshed from Google Patents.
Patent US3644590A successfully refreshed from Google Patents.
US3644590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diene/nitrile elastomeric blends
Assignee: Polysar Ltd
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Filing: 1969-11-21
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Granted: 1972-02-22
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Expires: 1989-11-21
Abstract
Abstract IMPROVED OIL-RESISTANT VULCANIZATE IS PREPARED BY VULCANIZING A BLEND OF (1) A RUBBERY COPOLYMER OF A 2-ALKYL BUTADIENE-1,3 AND AN ACRYLIC NITRILE WITH (2) A RUBBERY COPOLYMER OF BUTADIENE-1,3 AND ACRYLONITRILE. THE PREFERRED COPOLYMER (1) IS ISOPRENE/ACRYLONITRILE COPOLYMER THE VULCANIZATE IS CHARACTERIZED BY IMPROVED TEAR STRENGTH, COMPRESSION SET AND OIL-AGING PROPERTIES AND IS SUITABLE FOR THE PRODUCTIN OF THIN-WALLED MOULDED ARTICLES.
Inventors
- 👤 Douglas Coulthard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:18
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/02; C08L2205/00; C08L2205/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1386
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |