US2567952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sponge rubber
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1948-05-21
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Granted: 1951-09-18
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Expires: 1968-05-21
Abstract
No abstract record available.
Inventors
- 👤 Elisha B Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN A PROCESS FOR MANUFACTURING SPONGE RUBBER, THE STEPS OF (A) MIXING A RUBBER LATEX HAVING A CONCENTRATION OF APPROXIMATELY 50 PERCENT WITH APPROXIMATELY 2.25 PER CENT BY VOLUME OF A SODIUM SILICATE SOLUTION OF 41* BE. AND A RATIO OF ALKALI TO SILICA OF 1 TO 3.22, (B) INTRODUCING NITROUS OXIDE GAS UNDER PRESSURE WHILE SUBJECTING THE MIXTURE TO HIGH-SPEED AGITATION OF UP TO 5,000 R. P. M. WHEREBY A RUBBER FOAM IS PRODUCED, AND (C) CURING SAID FOAM.
Claim 2
Dependent Claim
80 words
IN A PROCESS FOR MANUFACTURING SPONGE RUBBER, THE STEPS OF (A) MIXING A RUBBER LATEX HAVING A CONCENTRATION OF APPROXIMATELY 50 PERCENT WITH APPROXIMATELY 2.25 PER CENT BY VOLUME OF A SODIUM SILICATE SOLUTION OF 41* BE. AND A RATIO OF ALKALI TO SILICA OF 1 TO 3.22, (B) INTRODUCING NITROUS OXIDE GAS UNDER PRESSURE WHILE SUBJECTING THE MIXTURE TO HIGH-SPEED AGITATION OF UP TO 5,000 R. P. M. WHEREBY A RUBBER FOAM IS PRODUCED, AND (C) CURING SAID FOAM.
References Cited (Backward Citations)
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Cited
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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) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |