US3280876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing stereoregular polybutadiene containing high structure carbon black and tire treads made therefrom
Assignee: Ashland LLC
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Filing: 1966-02-03
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Granted: 1966-10-25
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Expires: 1986-02-03
Abstract
No abstract record available.
Inventors
- 👤 Carl W Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:05
CPC Classifications
B; B60; B60C; B60C1/00; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN THE PRODUCTION OF A VULCANIZED POLYBUTADIENE RUBBER IN WHICH A RUBBER STOCK COMPRISING A POLYMER CONSISTING ESSENTIALLY OF A STEREO-REGULAR POLYBUTADIENE AT LEAST ABOUT 40% OF THE 1,4-BUTADIENE UNITS OF WHICH COMPRISE THE CIS-1,4 ISOMER IS SUBJECTED TO PROCESSING AND THEN VULCANIZATION, THE METHOD OF IMPROVING THE MIXING, MILLING, EXTRUSION AND TACK PROPERTIES OF SUCH A RUBBER STOCK DURING PROCESSING THEREOF AND OF PRODUCING A VULCANIZED POLYBUTADIENE RUBBER OF IMPROVED SHORE HARDNESS, WHICH COMPRISES: PROCESSING A RUBBER STOCK COMPRISING SUCH A POLYMER, A VULCANIZING AGENT, AND A CARRBON BLACK WITHIN THE FINENESS RANGE OF HAF, ISAF AND SAF GRADES OF REINFORCING FURNACE BLACKS, BUT HAVING STRUCTURE CHARACTERISTICS, AS REPRESENED BY MODULUS VALUES, WHICH VARY BY AT LEAST ABOUT +450 P.S.I., +275 P.S.I. AND +175 P.S.I., RESPECTIVELYM, FROM THOSE OF INDUSTRY REFERENCE BLACK #1 AS DETERMINED BY ASTM D-1522-60T: AND VULCANIZING THE RESULTANT PROCESSED STOCK.
Claim 2
Dependent Claim
145 words
IN THE PRODUCTION OF A VULCANIZED POLYBUTADIENE RUBBER IN WHICH A RUBBER STOCK COMPRISING A POLYMER CONSISTING ESSENTIALLY OF A STEREO-REGULAR POLYBUTADIENE AT LEAST ABOUT 40% OF THE 1,4-BUTADIENE UNITS OF WHICH COMPRISE THE CIS-1,4 ISOMER IS SUBJECTED TO PROCESSING AND THEN VULCANIZATION, THE METHOD OF IMPROVING THE MIXING, MILLING, EXTRUSION AND TACK PROPERTIES OF SUCH A RUBBER STOCK DURING PROCESSING THEREOF AND OF PRODUCING A VULCANIZED POLYBUTADIENE RUBBER OF IMPROVED SHORE HARDNESS, WHICH COMPRISES: PROCESSING A RUBBER STOCK COMPRISING SUCH A POLYMER, A VULCANIZING AGENT, AND A CARRBON BLACK WITHIN THE FINENESS RANGE OF HAF, ISAF AND SAF GRADES OF REINFORCING FURNACE BLACKS, BUT HAVING STRUCTURE CHARACTERISTICS, AS REPRESENED BY MODULUS VALUES, WHICH VARY BY AT LEAST ABOUT +450 P.S.I., +275 P.S.I. AND +175 P.S.I., RESPECTIVELYM, FROM THOSE OF INDUSTRY REFERENCE BLACK #1 AS DETERMINED BY ASTM D-1522-60T: AND VULCANIZING THE RESULTANT PROCESSED STOCK.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |