Patent US2821516A successfully refreshed from Google Patents.
US2821516A
Expired / Lapsed
US
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Butyl rubber silica composition and method of preparation
Assignee: Columbia Southern Chemical Corp
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Filing: 1954-09-27
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Granted: 1958-01-28
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Expires: 1974-09-27
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:07
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K5/00; C08K5/36; C08K5/37; C08K5/372
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A VULCANIZATE OF A COPOLYMER CONTAINING 70 TO 99 PERCENT BY WEIGHT OF ISOBUTYLENE AND 30 TO 1 PERCENT BY WEIGHT OF A DIOLEFIN, A SILICEOUS REINFORCING PIGMENT, 0.5 TO 1.5 PARTS BY WEIGHT OF ELEMENT SULPHUR, AND UP TO 2.5 PARTS BY WEIGHT OF A DIMORPHOLINE POLYSULFIDE PER 100 PARTS BY WEIGHT OF THE COPOLYMER.
Claim 2
Dependent Claim
56 words
A VULCANIZATE OF A COPOLYMER CONTAINING 70 TO 99 PERCENT BY WEIGHT OF ISOBUTYLENE AND 30 TO 1 PERCENT BY WEIGHT OF A DIOLEFIN, A SILICEOUS REINFORCING PIGMENT, 0.5 TO 1.5 PARTS BY WEIGHT OF ELEMENT SULPHUR, AND UP TO 2.5 PARTS BY WEIGHT OF A DIMORPHOLINE POLYSULFIDE PER 100 PARTS BY WEIGHT OF THE COPOLYMER.
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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |