US2862829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of foamed gypsum and the like
Assignee: National Foam System Inc
•
Filing: 1956-07-18
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Granted: 1958-12-02
•
Expires: 1976-07-18
Abstract
No abstract record available.
Inventors
- 👤 Jr John S Dixon
- 👤 Edward J Koloseus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:44
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2103/00; C04B2103/10; C04B2103/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A METHOD OF PRODUCING A LIGHTWEIGHT, CELLULAR GYPSUM COMPOSITION WHICH CONSISTS IN ADDING TO A CALCINED GYPSUM-WATER SLURRY A PREDETERMINED QUANTITY OF A PREFOAMED FOAM FORMED OF A GAS COMBINED UNDER SUPERATMOSPHERIC PRESSURE WITH A PROTEINACEUS SOLUTION OF A FOAM-FORMING LIQUID CONTAINING AS AN ADDITIVE THERETO AN ALKALI METAL SULFATE AN AGENT FOR CONTROLLING THE SET TIME OF THE FOAMED SLURRY, THE ACCELERATING AGENT BEING PRESENT IN THE FOAM-FORMING SOLUTION IN THE APPROXIMATE PROPORTION OF FROM 0.5 TO 2.0 POUNDS OF SAID AGENT TO EACH 5 GALLONS OF THE SOLUTION.
References Cited (Backward Citations)
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Cited
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Cited
US2383252A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |