US3640928A
Expired / Lapsed
US
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Stabilization of synthetic polymers
Assignee: Sankyo Co Ltd
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Filing: 1969-06-05
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Granted: 1972-02-08
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Expires: 1989-06-05
Abstract
Abstract THIS INVENTION DISCLOSED THE STABILIZATION OF SYNTHETIC A POLYMERS INCLUDING A POLYOLEFIN, A POLYVINYL CHLORIDE A POLYVINYLIDENE CHLORIDE, A POLYURETHANE AND A POLYAMIDE AGAINST PHOTO- AND THERMO-DETERIORATIONS THEREOF BY INCORPORATING THEREIN A PIPERIDINE DERIVATIVE IN A SUFFICIENT AMOUNT TO PREVENT SUCH DETERIORATIONS THEREOF, USUALLY IN AN AMOUNT OF 0.01 TO 5.0% BY WEIGHT BASED ON THE AMOUNT OF THE SYNTHETIC POLYMER.
Inventors
- 👤 Keisuke Murayama
- 👤 Syoji Morimura
- 👤 Takao Yoshioka
- 👤 Katsuaki Matsui
- 👤 Tomoyuki Kurumada
- 👤 Ichiro Watanabe
- 👤 Norlyuki Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/576; C07F9/59
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |