US2648644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Softening agent for rubber, and resultant rubber composition
Assignee: Shell Development Co
•
Filing: 1950-04-26
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Granted: 1953-08-11
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Expires: 1970-04-26
Abstract
No abstract record available.
Inventors
- 👤 Frank M Mcmillan
- 👤 De Loss E Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
C; C08; C08L; C08L7/00; C08L21/00; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/01; C08K5/04; C08K5/09; C08L95/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A SOFTENED RUBBER COMPOSITION MADE UP IN THE RATIO OF 100 PARTS RUBBER TO FROM 2 TO 20 PARTS OF A SOFTENER COMPOSITION COMPRISING FROM ABOUT 1 TO 25% OF AN AROMATIC CARBOXYLIC ACID TOGETHER WITH AT LEAST 25% OF AN AROMATIC PETROLEUM FRACTION AND FROM 0 TO 50% OF A NEUTRAL PETROLEUM OIL, SAID AROMATIC PETROLEUM FRACTION HAVING A VISCOSITY OF AT LEAST 10 CS. AT 210* F., SOFTENING BELOW 200* F., AND HAVING A SPECIFIC GRAVITY (D 20/4) OF FROM 0.9 TO 1.05.
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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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |