Patent US2739950A successfully refreshed from Google Patents.
US2739950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic sponges and formation thereof
Assignee: Individual
•
Filing: 1951-01-12
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Granted: 1956-03-27
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Expires: 1971-01-12
Abstract
No abstract record available.
Inventors
- 👤 Alex A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J2357/00; Y; Y10; Y10S; Y10S521/00; Y10S521/913; Y10S521/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS OF PRODUCING LIGHT, SOFT, PLASTIC SPONGE OF SYNTHETIC RESIN, COMPRISING INTERMIXING THERMOPLASTIC VINYL RESIN WITH ALUMINUM AND SODIUM HYDROXIDE FOR EXOTHERMIC REACTION TO RELEASE GAS, HEATING THE MIXTURE BELOW 150* F. TO INITIATE THEREIN THE EXOTHERMIC GAS RELEASE, THEREBY FORMING SOFT, ELASTIC SPONGE, THERE BEING PRESENT IN THE MIXTURE ABOUT ONE TO FIVE PERCENT UREA, AND AFTER FORMATION OF THE SOFT SPONGE HEATING THE SPONGE TO ABOUT 212* F. TO DECOMPOSE THE UREA AND FURTHER EXPAND THE SPONGE.
Claim 2
Dependent Claim
80 words
A PROCESS OF PRODUCING LIGHT, SOFT, PLASTIC SPONGE OF SYNTHETIC RESIN, COMPRISING INTERMIXING THERMOPLASTIC VINYL RESIN WITH ALUMINUM AND SODIUM HYDROXIDE FOR EXOTHERMIC REACTION TO RELEASE GAS, HEATING THE MIXTURE BELOW 150* F. TO INITIATE THEREIN THE EXOTHERMIC GAS RELEASE, THEREBY FORMING SOFT, ELASTIC SPONGE, THERE BEING PRESENT IN THE MIXTURE ABOUT ONE TO FIVE PERCENT UREA, AND AFTER FORMATION OF THE SOFT SPONGE HEATING THE SPONGE TO ABOUT 212* F. TO DECOMPOSE THE UREA AND FURTHER EXPAND THE SPONGE.
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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |