US2776330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sponge rubber
Assignee: Sumitomo Rubber USA LLC
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Filing: 1953-02-26
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Granted: 1957-01-01
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Expires: 1973-02-26
Abstract
No abstract record available.
Inventors
- 👤 Jones Frederick Arthur
- 👤 Newnham John Leathem Matthew
- 👤 Mckeand Douglas Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08J9/0061; C08L; C08L21/00; C08J2321/00; C08J2479/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
A METHOD OF MAKING CELLULAR RUBBER PRODUCTS WHICH COMPRISES COMPOUNDING A LATEX CONTAINING RUBBER HYDROCARBONS IN WHICH THE RUBBER HYDROCARBONS COMPRISE FROM 50% TO 100% OF NATURAL RUBBER WITH SULPHUR, VULCARNZATION ACCELERATORS AND AN ACYCLIC POLYALKYLENE POLYAMINE OF THE FORMULA H2NR.(NHR)NNH2 IN WHICH R REPRESENTS AN ALKYLENE RADICAL HAVING UP TO THREE CARBON ATOMS AND N RQUALS FROM 1 TO 4, BEATING SAID LATEX WITH AIR TO FORM A FOAM AN GELLING SAID FOAMED LATEX WITH A DELAYED ACTION GELLING AGENT.
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) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |