US2820837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dispersing carbon black in bulk rubber
Assignee: Uniroyal Inc
•
Filing: 1954-03-30
•
Granted: 1958-01-21
•
Expires: 1974-03-30
Abstract
No abstract record available.
Inventors
- 👤 Frank B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:01
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08K; C08K3/00; C08K3/02; C08K3/04; C08J2307/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
AN IMPROVED METHOD OF EFFECTING MICROSCOPIC DISPERSION OF CARBON BLACK IN A RUBBER STOCK COMPRISING SUBJECTING OF INTENSE SHEARING ACTION IN A BANBURY MIXER A MIXTURE OF 100 PARTS OF COMPRESSED CARBON BLACK, FROM 150 TO 250 PARTS OF BULK RUBBER, FROM 10 TO 250 PARTS OF WATER AND FROM 2 TO 10 PARTS OF AN ANIONIC WETTING AGENT, AND THEREAFTER REMOVING THE WATER FROM THE MIXTURE.
Claim 2
Dependent Claim
67 words
AN IMPROVED METHOD OF EFFECTING MICROSCOPIC DISPERSION OF CARBON BLACK IN A RUBBER STOCK COMPRISING SUBJECTING OF INTENSE SHEARING ACTION IN A BANBURY MIXER A MIXTURE OF 100 PARTS OF COMPRESSED CARBON BLACK, FROM 150 TO 250 PARTS OF BULK RUBBER, FROM 10 TO 250 PARTS OF WATER AND FROM 2 TO 10 PARTS OF AN ANIONIC WETTING AGENT, AND THEREAFTER REMOVING THE WATER FROM THE MIXTURE.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |