US2821232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber tire tread composition containing carbon black and silica and tire made from same
Assignee: Columbia Southern Chemical Corp
•
Filing: 1954-07-08
•
Granted: 1958-01-28
•
Expires: 1974-07-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; B; B60; B60C; B60C1/00; C08K3/34; C08K3/36; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A VULCANIZED RUBBER COMPOSITION COMPRISING NATURAL RUBBER AND A REINFORCING QUANTITY OF A MIXTURE OF CARBON BALCK AND FINELY DIVIDED PRECIPITATED HYDRATED SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE IN THE RANGE OF 0.02 TO 0.05 MICRON AND A SURFACE AREA IN THE RANGE OF 50 TO 200 SQUARE METERS PER GRAM AND CONSITUTING 15 TO 60 PERCENT OF THE COMBINED WEIGHT OF THE CARBON BLACK AND SILICA AND AT LEAST 10 PERCENT OF THE WEIGHT OF RUBBER.
Claim 2
Dependent Claim
78 words
A VULCANIZED RUBBER COMPOSITION COMPRISING NATURAL RUBBER AND A REINFORCING QUANTITY OF A MIXTURE OF CARBON BALCK AND FINELY DIVIDED PRECIPITATED HYDRATED SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE IN THE RANGE OF 0.02 TO 0.05 MICRON AND A SURFACE AREA IN THE RANGE OF 50 TO 200 SQUARE METERS PER GRAM AND CONSITUTING 15 TO 60 PERCENT OF THE COMBINED WEIGHT OF THE CARBON BLACK AND SILICA AND AT LEAST 10 PERCENT OF THE WEIGHT OF RUBBER.
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 |