US3899555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing ceramic structures
Assignee: Nissan Motor Co Ltd
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Filing: 1971-12-27
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Granted: 1975-08-12
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Expires: 1991-12-27
Abstract
Abstract A method of preparing a porous ceramic structure having a multiplicity of voids or pores of small size randomly distributed therein. The method comprises the steps of dispersing in a liquid such as water a ceramic material in powder form and/or in shortcut fiber form together with combustible organic fibers in shortcut form to obtain a suspension containing the ceramic material and the organic fibers, making a sheet of ceramic-dispersed paper of the suspension, and baking the resultant sheet of ceramicdispersed paper for sintering the ceramic dispersed therein and burning out the organic fibers dispersed therein. The obtained ceramic structure has a sufficient rigidity and a wide effective surface area so that it finds a wide variety of applications for example, as a heat exchanger element, a catalyst carrier and a radiator element.
Inventors
- 👤 Hiroshi Takao
- 👤 Kinmochi Togawa
- 👤 Satoshi Abe
- 👤 Sigeyosi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:05
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/04; C; C04; C04B; C04B38/00; C04B38/008; C04B38/0083; C04B38/06; C04B38/063; C04B38/0635; C04B38/0645; C04B38/065
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
A METHOD OF PERPARING A CERAMIC STRUCTURE, COMPRISING THE STEPS OF: A. DISPERSING A MIXTURE CMPRISING PARTICULATE CERAMIC MATERIALS IN POWDERR OR SHORT FIBER FORM TOGETHR WITH SHORT CELLULOSE FIBERS IN AN AQUEOUS MEDIUM TO FORM A NON-COLLOIDAL SLURRIED SUSPENSION OF THE PARTICULATE CERAMIC MATERIALS AND THE CELLULOSE FIBERS IN SAID AQUEOUS MEDIUM, B. INTRODUCING SAID SUSPENSION ONTO A WIRE CLOTH PAPERMAKING MACHINE: C. DRAINING SAID AQUEOUS MEDIUM FROM SAID INSOLUBLE PARTICULATE MATERIAL AND FIBERS THROUGH SAID WIRE CLOTH TO FORM A MATTED SHEET OF PARTICULATE MATERIAL AND CELLULOSE FIBERS ON SAID WIRE CLOTH: D. REMOVING SAID SHEET FROM SAID WIRE CLOTH TO FORM A PAPER SHEET IN WHICH SAID MEXTURE OF CERAMIC MATERIALS AND SAID CELLULOSE FIBERS ARE RANDOMLY AND UNIFORMLY DISPERSED: E. DRYING THE RESULTANT PAPER SHEET TO REMOVE EXCESS WATER AND TO FORM A PLASTICIZED GREEN CERAMIC SHEET: F. FORMING SAID GREEN CERAMIC SHEET INTO APLASTICIZED GREEN HONEYCOMB STRUCTURE: G. BAKING TH GREEN HONEYCOMB STRUCTURE FOR A TIME AND AT A TEMPERATURE SUFFICIENT FOR SINTERING THE PARTICLATE CERAMIC MATERIALS DISPERSED THEREIN, TO A SELF-SUPPORTING HONEYCOMB AND FOR BURNING OFF THE CELLULOSE FIBERS DISPERSED THEREIN, THEREBY LEAVING A POROUS CERAMIC HONEYCOMB HAVING ITS PORES RANDOMLY DISTRIBUTE IN THE WALL THEREOF.
Claim 2
Independent Claim
202 words
A METHOD OF PERPARING A CERAMIC STRUCTURE, COMPRISING THE STEPS OF: A. DISPERSING A MIXTURE CMPRISING PARTICULATE CERAMIC MATERIALS IN POWDERR OR SHORT FIBER FORM TOGETHR WITH SHORT CELLULOSE FIBERS IN AN AQUEOUS MEDIUM TO FORM A NON-COLLOIDAL SLURRIED SUSPENSION OF THE PARTICULATE CERAMIC MATERIALS AND THE CELLULOSE FIBERS IN SAID AQUEOUS MEDIUM, B. INTRODUCING SAID SUSPENSION ONTO A WIRE CLOTH PAPERMAKING MACHINE: C. DRAINING SAID AQUEOUS MEDIUM FROM SAID INSOLUBLE PARTICULATE MATERIAL AND FIBERS THROUGH SAID WIRE CLOTH TO FORM A MATTED SHEET OF PARTICULATE MATERIAL AND CELLULOSE FIBERS ON SAID WIRE CLOTH: D. REMOVING SAID SHEET FROM SAID WIRE CLOTH TO FORM A PAPER SHEET IN WHICH SAID MEXTURE OF CERAMIC MATERIALS AND SAID CELLULOSE FIBERS ARE RANDOMLY AND UNIFORMLY DISPERSED: E. DRYING THE RESULTANT PAPER SHEET TO REMOVE EXCESS WATER AND TO FORM A PLASTICIZED GREEN CERAMIC SHEET: F. FORMING SAID GREEN CERAMIC SHEET INTO APLASTICIZED GREEN HONEYCOMB STRUCTURE: G. BAKING TH GREEN HONEYCOMB STRUCTURE FOR A TIME AND AT A TEMPERATURE SUFFICIENT FOR SINTERING THE PARTICLATE CERAMIC MATERIALS DISPERSED THEREIN, TO A SELF-SUPPORTING HONEYCOMB AND FOR BURNING OFF THE CELLULOSE FIBERS DISPERSED THEREIN, THEREBY LEAVING A POROUS CERAMIC HONEYCOMB HAVING ITS PORES RANDOMLY DISTRIBUTE IN THE WALL THEREOF.
Claim 3
Dependent Claim
24 words
A method according to claim 1, further comprising the step of adding rosin as a water repellent to said liquid before the dispersing step.
Claim 4
Dependent Claim
28 words
A method according to claim 1, further comprising the step of adding to said suspension a binder selected from the group consisting of polyvinylalcohol, gum arabic and rosin.
Claim 5
Dependent Claim
31 words
A method according to claim 1, further comprising the step of adding to said suspension a dispersing agent selected from the group consisting of water glass, hydrochloric acid and sodium hydroxide.
Claim 6
Dependent Claim
23 words
A method according to claim 1, wherein the shaping step includes the step of forming a sheet of paper into a cylindrical shape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |