US4587068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making ceramic tapes
Assignee: Tokyo Electron Ltd
•
Filing: 1983-06-24
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Granted: 1986-05-06
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Expires: 2003-06-24
Abstract
Abstract A method of producing ceramic items which does not necessitate the use of high vapor pressure organic solvents, aqueous solvents, binders or plasticizers. A monomer is used as a vehicle for deflocculation of the ceramic powder and, after forming, is polymerized to form a matrix which binds the ceramic particles together.
Inventors
- 👤 Vijay Borase
- 👤 James F. Smith
- 👤 Efraim Sagiv
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:59
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/01; C04B35/10; C04B35/111; C04B35/638
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
48 words
A method of preparing ceramic tapes comprising: (1) physically mixing a slip comprising a ceramic powder, a deflocculant, and at least one monomer, in the absence of either water or an inert volatile organic solvent; (2) forming the slip on a carrier surface; and (3) polymerizing the monomer.
Claim 2
Independent Claim
48 words
A method of preparing ceramic tapes comprising: (1) physically mixing a slip comprising a ceramic powder, a deflocculant, and at least one monomer, in the absence of either water or an inert volatile organic solvent; (2) forming the slip on a carrier surface; and (3) polymerizing the monomer.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the monomer is polymerized by heating.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the slip is concentrated by removing a portion of the monomer prior to forming.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein a portion of the deflocculent is removed prior to forming.
Claim 6
Dependent Claim
15 words
The method of claim 3 wherein a portion of the monomer is removed by electrophoresis.
Claim 7
Dependent Claim
16 words
The method of claim 3 wherein a portion of the monomer is removed by filter pressing.
Claim 8
Dependent Claim
19 words
The method of claim 2 wherein the exposed surface of the slip is covered by a second carrier surface.
Claim 9
Dependent Claim
14 words
The method of claim 2 wherein the slip is formed between two carrier surfaces.
Claim 10
Dependent Claim
16 words
The method of claim 2 wherein the monomer comprises an ester of an unsaturated carboxylic acid.
Claim 11
Dependent Claim
16 words
The method of claim 2 wherein the monomer comprises an anhydride of an unsaturated carboxylic acid.
Claim 12
Dependent Claim
31 words
The method of claim 9 or claim 10 wherein the unsaturated carboxylic acid is selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, itaconic acid and citraconic acid.
Claim 13
Dependent Claim
14 words
The method of claim 9 or claim 10 wherein the deflocculent comprises fish oil.
Claim 14
Dependent Claim
32 words
The method of claim 9 or claim 10 wherein the deflocculent comprises a nonionic surfactant selected from the group consisting of ethylene oxide condensates of alcohols, phenols, amines, amides and carboxylic acids.
Claim 15
Dependent Claim
16 words
The method of claim 9 or claim 10 wherein the deflocculent comprises a quaternary ammonium compound.
Claim 16
Dependent Claim
30 words
The method of claim 9 or claim 10 wherein the deflocculent comprises a carboxylic acid selected from the group consisting of oleic acid, stearic acid, caprylic acid and methacrylic acid.
Claim 17
Dependent Claim
11 words
The method of claim 1 wherein the ceramic powder is alumina.
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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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |