US3897259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing incombustibles
Assignee: Individual
•
Filing: 1973-10-24
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Granted: 1975-07-29
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Expires: 1993-10-24
Abstract
Abstract A process for manufacturing plaster boards from calcium sulfite hydrate by-products from a smoke-discharging desulfurizer using lime. The calcium sulfite hydrate is mixed with neutral magnesium carbonate so as to prevent sulfurous acid gas from discharging from the smoke-discharging type desulfurizer and to settle the problem of public pollution.
Inventors
- 👤 Shiro Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:13
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/10; C04B28/105; C04B18/00; C04B18/04; C04B18/06; C04B18/062; C04B18/064; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A PROCESS FOR MANUFACTURING INCOMBUSTIBLES, COMPRISING THE STEPS OF MIXING 55-25 WEIGHT % OF CALCIUM SULFITE HYDRATE IN THE FORM OF THE AQUEOUS SUSPENSION BY-PRODUCT FROM A SMOKE-DISCHARGING TYPE DESULFURIZER USING LIME, WITH 30-55 WEIGHT % OF NEUTRAL MAGNESIUM CARBONATE AND 15-20 WEIGHT % OF FIBROUS MATERIAL, PARTIALLY DEHYDRATING THE SUSPENSION BY FOMING A WET MAT OF THE SUSPENSION IN ORDER TO MAKE A FORMED SHEET-LIKE MEMBER, HEATING THE FORMED MEMBER AT A TEMPERATURE OF 85-95*C. TO HARDEN IT, AND FINALLY DYING THE FORMED MEMBER.
Claim 2
Dependent Claim
85 words
A PROCESS FOR MANUFACTURING INCOMBUSTIBLES, COMPRISING THE STEPS OF MIXING 55-25 WEIGHT % OF CALCIUM SULFITE HYDRATE IN THE FORM OF THE AQUEOUS SUSPENSION BY-PRODUCT FROM A SMOKE-DISCHARGING TYPE DESULFURIZER USING LIME, WITH 30-55 WEIGHT % OF NEUTRAL MAGNESIUM CARBONATE AND 15-20 WEIGHT % OF FIBROUS MATERIAL, PARTIALLY DEHYDRATING THE SUSPENSION BY FOMING A WET MAT OF THE SUSPENSION IN ORDER TO MAKE A FORMED SHEET-LIKE MEMBER, HEATING THE FORMED MEMBER AT A TEMPERATURE OF 85-95*C. TO HARDEN IT, AND FINALLY DYING THE FORMED MEMBER.
Claim 3
Dependent Claim
10 words
The formed member produced by the process of claim 1.
Claim 4
Dependent Claim
108 words
A process for manufacturing incombustibles comprising the steps of mixing 55-25 weight % of calcium sulfite hydrate in the form of the by-product from a smoke-discharging type desulfurizer using lime, and a magnesium hydroxide suspension in an amount equivalent to 30-55 weight % of neutral magnesium carbonate, blowing in a carbon dioxide-containing gas to form said amount of magnesium carbonate in situ, adding 15-20 weIght % of fibrous material to the aqueous suspension, partially dehydrating and forming a wet mat of the suspension in order to make a formed member, heating the formed member at a temperature of 85*-95*C. to harden it and finally drying the formed member.
Claim 5
Dependent Claim
108 words
A process for manufacturing incombustibles comprising the steps of mixing 55-25 weight % of calcium sulfite hydrate in the form of the by-product from a smoke-discharging type desulfurizer using lime, and a magnesium hydroxide suspension in an amount equivalent to 30-55 weight % of neutral magnesium carbonate, blowing in a carbon dioxide-containing gas to form said amount of magnesium carbonate in situ, adding 15-20 weIght % of fibrous material to the aqueous suspension, partially dehydrating and forming a wet mat of the suspension in order to make a formed member, heating the formed member at a temperature of 85*-95*C. to harden it and finally drying the formed member.
References Cited (Backward Citations)
US3642445A
Cited
US3785840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |