Patent US4152168A successfully refreshed from Google Patents.
US4152168A
Expired / Lapsed
US
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Process for preparing cement product
Assignee: Kubota Corp
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Filing: 1977-11-03
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Granted: 1979-05-01
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Expires: 1997-11-03
Abstract
Abstract A process comprising the steps of adding an inorganic foamed aggregate, an inorganic solid aggregate and a reinforcing fiber to cement to prepare a cement mixture, kneading the cement mixture with addition of 3 to 15% by weight of water based on the mixture to obtain a relatively hard kneaded mixture, press-molding the kneaded mixture at pressure of 200 to 600 kg/cm 2 , adding water to the molded piece to adjust the water content thereof, preheating the molded piece at a temperature of 40° to 70° C. before curing, spraying to the surface of the heated molded piece an aqueous dispersion prepared from resin and cement-type coloring material and containing inorganic particles 0.1 to 1.5 mm in size, drying the coated piece, applying a colored resin composition to the coating, and curing the resulting piece in an autoclave with pressurized steam, whereby a colored roofing panel or like cement product can be prepared.
Inventors
- 👤 Naomichi Yano
- 👤 Kuniaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:49
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B28; B28B; B28B1/00; B28B1/52; C04B28/00; C04B28/02; C04B40/00; C04B40/0028; C04B41/45; C04B41/46; C04B41/48; C04B41/50; C04B41/5076; C04B41/60; C04B41/61; C04B41/62; C04B41/63; C04B41/65; C04B2111/00; C04B2111/00474; C04B2111/00586
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
A process for preparing a cement product by adding water to a mixture of cement, an inorganic solid aggregate and a reinforcing fiber comprising the steps of: adding an inorganic foamed aggregate, an inorganic solid aggregate and a reinforcing fiber to cement to prepare a cement mixture, kneading the cement mixture with addition of 3 to 15% by weight of water based on the mixture to obtain a relatively hard kneaded mixture, press-molding the kneaded mixture in a mold at pressure of 200 to 600 kg/cm 2 , adding water to the molded piece to adjust the water content of the molded piece, spontaneously curing the molded piece to obtain a semi-hardened piece, applying a colored liquid resin composition containing inorganic particles to the surface of the semi-hardened molded piece, and curing the resulting molded piece with pressurized steam.
Claim 2
Dependent Claim
139 words
A process for preparing a cement product by adding water to a mixture of cement, an inorganic solid aggregate and a reinforcing fiber comprising the steps of: adding an inorganic foamed aggregate, an inorganic solid aggregate and a reinforcing fiber to cement to prepare a cement mixture, kneading the cement mixture with addition of 3 to 15% by weight of water based on the mixture to obtain a relatively hard kneaded mixture, press-molding the kneaded mixture in a mold at pressure of 200 to 600 kg/cm 2 , adding water to the molded piece to adjust the water content of the molded piece, spontaneously curing the molded piece to obtain a semi-hardened piece, applying a colored liquid resin composition containing inorganic particles to the surface of the semi-hardened molded piece, and curing the resulting molded piece with pressurized steam.
Claim 3
Dependent Claim
15 words
A process as defined in claim 1 wherein the cement product is a roofing panel.
Claim 4
Dependent Claim
144 words
A process for preparing a cement product by adding water to a mixture of cement, an inorganic solid aggregate and a reinforcing fiber comprising the steps of: adding an inorganic foamed aggregate, an inorganic solid aggregate and a reinforcing fiber to cement to prepare a cement mixture, kneading the cement mixture with addition of 3 to 15% by weight of water based on the mixture to obtain a relatively hard kneaded mixture, press-molding the kneaded mixture in a mold at pressure of 200 to 600 kg/cm 2 , adding water to the molded piece to adjust the water content of the molded piece, preheating the molded piece at a temperature of 40 to 70° C. before curing, applying a colored liquid resin composition containing inorganic particles to the surface of the preheated uncured molded piece, and curing the resulting molded piece with pressurized steam.
Claim 5
Dependent Claim
144 words
A process for preparing a cement product by adding water to a mixture of cement, an inorganic solid aggregate and a reinforcing fiber comprising the steps of: adding an inorganic foamed aggregate, an inorganic solid aggregate and a reinforcing fiber to cement to prepare a cement mixture, kneading the cement mixture with addition of 3 to 15% by weight of water based on the mixture to obtain a relatively hard kneaded mixture, press-molding the kneaded mixture in a mold at pressure of 200 to 600 kg/cm 2 , adding water to the molded piece to adjust the water content of the molded piece, preheating the molded piece at a temperature of 40 to 70° C. before curing, applying a colored liquid resin composition containing inorganic particles to the surface of the preheated uncured molded piece, and curing the resulting molded piece with pressurized steam.
Claim 6
Dependent Claim
37 words
A process as defined in claim 3 wherein the colored liquid resin composition containing inorganic particles is prepared by adding an emulsion of water-dispersible resin to a mixture of a colored cement composition and the inorganic particles.
Claim 7
Dependent Claim
30 words
A process as defined in claim 3 wherein the colored liquid resin composition containing inorganic particles is prepared by adding the inorganic particles to a colored emulsion of water-dispersible resin.
Claim 8
Dependent Claim
67 words
A process as defined in claim 3 wherein the step of applying a colored liquid resin composition is carried out by spraying to the surface of the molded piece a resin composition prepared by adding an emulsion of water-dispersible resin to a mixture of a pigment and the inorganic particles, thereafter drying the coated molded piece, and subsequently applying a colored resin composition to the resulting piece.
Claim 9
Dependent Claim
68 words
A process as defined in claim 3 wherein the step of applying a colored liquid resin composition is carried out by spraying to the surface of the molded piece a resin composition prepared by adding an emulsion of water-dispersible resin to a mixture of a pigment and the inorganic particles, thereafter drying the coated molded piece, and subsequently applying a colored inorganic coating composition to the resulting piece.
Claim 10
Dependent Claim
34 words
A process as defined in claim 7 wherein the molded piece resulting from the curing step is cooled and then heated again, and a transparent resin coating composition is applied to the heated piece.
Claim 11
Dependent Claim
15 words
A process as defined in claim 6 wherein the cement product is a roofing panel.
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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |