Patent US3062802A successfully refreshed from Google Patents.
US3062802A
Expired / Lapsed
US
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Treatment of rubber
Assignee: NATURAL RUBBER PRODUCERS
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Filing: 1959-09-08
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Granted: 1962-11-06
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Expires: 1979-09-08
Abstract
No abstract record available.
Inventors
- 👤 Cunneen John Ivan
- 👤 Watson William Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:02
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
53 words
A PROCESS FOR THE PRODUCTION OF MODIFIED RUBBERY POLYMERS HAVING A RETARDATION RATIO ABOVE 100:1 AND A SULPHUR CONTENT BELOW 1%, WHICH PROCESS COMPRISES TREATING A RUBBERY HYDROCARBON POLYMER SELECTED FROM THE CLASS CONSISTING OF NATURAL AND SYNTHETIC POLYISOPRENES AND STEREOSPECIFIC POLYBUTADIENES, WITH SULPHUR DIOXIDE AT A TEMPERATURE OF FROM 100*C. TO 250*C.
Claim 2
Dependent Claim
53 words
A PROCESS FOR THE PRODUCTION OF MODIFIED RUBBERY POLYMERS HAVING A RETARDATION RATIO ABOVE 100:1 AND A SULPHUR CONTENT BELOW 1%, WHICH PROCESS COMPRISES TREATING A RUBBERY HYDROCARBON POLYMER SELECTED FROM THE CLASS CONSISTING OF NATURAL AND SYNTHETIC POLYISOPRENES AND STEREOSPECIFIC POLYBUTADIENES, WITH SULPHUR DIOXIDE AT A TEMPERATURE OF FROM 100*C. TO 250*C.
Claim 3
Dependent Claim
32 words
A PROCESS ACCORDING TO CLAIM 1 WHEREIN THE SULPHUR DIOXIDE IS EMPLOYED IN THE FORM OF A COMPOUND THEREOF WHICH IS DECOMPOSABLE AT THE TEMPERATURE OF THE TREATMENT TO RELEASE SULPHUR DIOXIDE.
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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |