Patent US2876883A successfully refreshed from Google Patents.
Patent US3310522A successfully refreshed from Google Patents.
US3310522A
Expired / Lapsed
US
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Cross-linking process of polyvinyl chloride
Assignee: Furukawa Electric Co Ltd
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Filing: 1962-07-16
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Granted: 1967-03-21
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Expires: 1982-07-16
Abstract
No abstract record available.
Inventors
- 👤 Takahashi Sakae
- 👤 Nishimura Hiroshi
- 👤 Inui Mitsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:38
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/36; C08K5/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR CROSS-LINKING POLYVINYL CHLORIDE THE IMPROVEMENT WHICH COMPRISES ADDING TO A POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMER AND COPOLYMERS OF VINYL CHLORIDE, A MIXTURE CONSISTING ESSENTIALLY OF BETWEEN ABOUT 10 TO 40 PARTS BY WEIGHT OF AT LEAST ONE METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF ZINC, LEAD, ANTIMONY, CALCIUM, IRON, CADMIUM, BARIUM AND MAGNESIUM OXIDES AND 0.5 TO 5.0 PARTS BY WEIGHT OF 2-MERCAPTO-IMIDAZOLINE, BOTH BASED ON 100 PARTS BY WEIGHT OF SAID MEMBER, AND VULCANZING SAID MIXTURE AT A TEMPERATURE ABOVE 130*C. FOR AT LEAST APPROXIMATELY 30 MINUTES IN ORDER TO COMPLETE THE VULCANIZATION.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR CROSS-LINKING POLYVINYL CHLORIDE THE IMPROVEMENT WHICH COMPRISES ADDING TO A POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMER AND COPOLYMERS OF VINYL CHLORIDE, A MIXTURE CONSISTING ESSENTIALLY OF BETWEEN ABOUT 10 TO 40 PARTS BY WEIGHT OF AT LEAST ONE METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF ZINC, LEAD, ANTIMONY, CALCIUM, IRON, CADMIUM, BARIUM AND MAGNESIUM OXIDES AND 0.5 TO 5.0 PARTS BY WEIGHT OF 2-MERCAPTO-IMIDAZOLINE, BOTH BASED ON 100 PARTS BY WEIGHT OF SAID MEMBER, AND VULCANZING SAID MIXTURE AT A TEMPERATURE ABOVE 130*C. FOR AT LEAST APPROXIMATELY 30 MINUTES IN ORDER TO COMPLETE THE VULCANIZATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |