US4028454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for agglomerating compressible mineral substances under the form of powder, particles or fibres
Assignee: Coordination et Developpement de I'nnovation Cordi SA
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Filing: 1974-12-31
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Granted: 1977-06-07
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Expires: 1994-12-31
Abstract
Abstract The invention pertains to a process for agglomerating compressible powders, particles or fibres of mineral substances, said process comprising the steps of placing at least one layer of a steam and gas pervious product on a layer of said compressible substances in which the water content is such that, after vaporization, a sufficient amount of water is still present to ensure the desired chemical reaction, then subjecting the layers to the simultaneous action of pressure and heating.
Inventors
- 👤 Joseph Davidovits
- 👤 Jean Jacques Legrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/001; C04B40/00; C04B40/02; Y; Y10; Y10S; Y10S264/00; Y10S264/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
The method of making a plate, comprising: a. forming a mixture of clay, caustic soda and water into a moldable mass; b. placing said mass between press platens, c. between said mass and said platens disposing moistened layers of porous material and disposing perforated grid members between said layers and said platens, d. pressing and mass between said layers and grid members with said platens heated to at least 150° C for a sufficient time to react said mixture and to form and cure said plate.
Claim 2
Independent Claim
86 words
The method of making a plate, comprising: a. forming a mixture of clay, caustic soda and water into a moldable mass; b. placing said mass between press platens, c. between said mass and said platens disposing moistened layers of porous material and disposing perforated grid members between said layers and said platens, d. pressing and mass between said layers and grid members with said platens heated to at least 150° C for a sufficient time to react said mixture and to form and cure said plate.
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |