Patent US2117535A successfully refreshed from Google Patents.
Patent US2635971A successfully refreshed from Google Patents.
US2635971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frothed latex sponge
Assignee: Wingfoot Corp
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Filing: 1951-03-16
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Granted: 1953-04-21
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Expires: 1971-03-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas H Rogers
- 👤 Harold H Heineman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:03
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08L; C08L21/00; C08J2201/00; C08J2201/02; C08J2201/038; C08J2321/00; C08J2321/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD OF IMPROVING THE PHYSICAL PROPERTIES OF FROTHED RUBBER LATEX SPONGE MADE FROM A LATEX SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF NATURAL RUBBER LATEX AND A SYNTHETIC RUBBER LATEX RESULTING FROM THE POLYMERIZATION OF A CONJUGATED DIENE HYDROCARBON, WHICH COMPRISES TREATING THE SPONGE WITH WATER CONTAINING A COMPOSITION SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF AN ALKALINE EARTH HYDROXIDE, AN ALKALINE EARTH OXIDE, AND AN ALKALINE EARTH SALT, REMOVING EXCESS TREATING AGENT AND DRYING THE TREATED SPONGE WHEREBY AT LEAST ONE PORPERTY OF THE GROUP CONSISTING OF ELONGATION, PERMANENT SET RETENTION, TENSILE, SNAP, AND ODOR IS IMPROVED IN COMPARISON TO SPONGE NOT TREATED WITH SAID TREATING AGENT.
Claim 2
Independent Claim
115 words
THE METHOD OF IMPROVING THE PHYSICAL PROPERTIES OF FROTHED RUBBER LATEX SPONGE MADE FROM A LATEX SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF NATURAL RUBBER LATEX AND A SYNTHETIC RUBBER LATEX RESULTING FROM THE POLYMERIZATION OF A CONJUGATED DIENE HYDROCARBON, WHICH COMPRISES TREATING THE SPONGE WITH WATER CONTAINING A COMPOSITION SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF AN ALKALINE EARTH HYDROXIDE, AN ALKALINE EARTH OXIDE, AND AN ALKALINE EARTH SALT, REMOVING EXCESS TREATING AGENT AND DRYING THE TREATED SPONGE WHEREBY AT LEAST ONE PORPERTY OF THE GROUP CONSISTING OF ELONGATION, PERMANENT SET RETENTION, TENSILE, SNAP, AND ODOR IS IMPROVED IN COMPARISON TO SPONGE NOT TREATED WITH SAID TREATING 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) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |