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US4459450A
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Method of reducing pollution in microwave devulcanization process
Assignee: Goodyear Tire and Rubber Co
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Filing: 1982-09-28
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Granted: 1984-07-10
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Expires: 2002-09-28
Abstract
Abstract This invention provides a method of controlling the pollution in a microwave devulcanization process consisting of passing particles of sulfur-vulcanized elastomer containing polar groups through a microwave energy devulcanization device to generate heat in the devulcanization of said particles whereby said particles exits said device at a temperature in excess of 260° C., feeding said particles from the devulcanization device to feed input of an extruder, extruding said particles to exit the extruder at a temperature of about 90° to 125° C. as an extrudate. The extrudate can be used per se as a compounding stock or sent to a mill to be sheeted and stored until needed.
Inventors
- 👤 Keith A. Tyler
- 👤 Gene L. Cerny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:24
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H05B6/788
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A method of controlling the pollution in a microwave devulcanization process consisting of passing particles of sulfur-vulcanized elastomer containing polar groups through a microwave energy devulcanization device which generates heat in the devulcanization of said particles whereby said particles exits said device at a temperature in excess of 260° C., feeding said particles from the devulcanization device to a feed input of an extruder, extruding said particles to exit the extruder at a temperature of about 90° to 125° C. as an extrudate.
Claim 2
Independent Claim
83 words
A method of controlling the pollution in a microwave devulcanization process consisting of passing particles of sulfur-vulcanized elastomer containing polar groups through a microwave energy devulcanization device which generates heat in the devulcanization of said particles whereby said particles exits said device at a temperature in excess of 260° C., feeding said particles from the devulcanization device to a feed input of an extruder, extruding said particles to exit the extruder at a temperature of about 90° to 125° C. as an extrudate.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the extruder has a screw with the ratio of length of screw to its diameter being about 3.5-4.5 to 1.
References Cited (Backward Citations)
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US4107354A
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US4104205A
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US4129768A
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US4123584A
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US4130616A
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |