Patent US2903439A successfully refreshed from Google Patents.
US2903439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic rubbers reinforced with siliceous pigments
Assignee: Columbia Southern Chemical Corp
•
Filing: 1956-01-05
•
Granted: 1959-09-08
•
Expires: 1976-01-05
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:25
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A VULCANIZATE OF A RUBBERY COPOLYMER OF 70 TO 99 PERCENT BY WEIGHT OF ISOBUTYLENE AND 30 TO 1 PERCENT BY WEIGHT OF DIOLEFIN, A FINELY DIVIDED PRECIPITATED SILICEOUS REINFORCING PIGMENT HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF LESS THAN 0.1 MICRON AND A SULFURIZED TALL OIL OF STICKY VISCOUS CONSISTENCY IN AN AMOUNT OF UP TO 8 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE COPOLYMER.
Claim 2
Dependent Claim
69 words
A VULCANIZATE OF A RUBBERY COPOLYMER OF 70 TO 99 PERCENT BY WEIGHT OF ISOBUTYLENE AND 30 TO 1 PERCENT BY WEIGHT OF DIOLEFIN, A FINELY DIVIDED PRECIPITATED SILICEOUS REINFORCING PIGMENT HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF LESS THAN 0.1 MICRON AND A SULFURIZED TALL OIL OF STICKY VISCOUS CONSISTENCY IN AN AMOUNT OF UP TO 8 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE COPOLYMER.
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) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |