US3767638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefine composition
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1971-11-08
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Granted: 1973-10-23
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Expires: 1991-11-08
Abstract
Abstract POLYOLEFINES SUCH AS POLYETHYLENE AND POLYPROPYLENE CONTAIN AS A PRODEGRADANT A COMPOUND CONTAINING A CONJUGATED SYSTEM OF AT LEAST 3 DOUBLE BONDS. THE PREFERRED PRODEGRADANTS ARE QUINONES, E.G. ANTHRAQUINONE.
Inventors
- 👤 Johnson B Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:32
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0033; Y; Y10; Y10S; Y10S260/00; Y10S260/43
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |