Patent US4939197A successfully refreshed from Google Patents.
US4939197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of modifying thermal properties of polycarbosilane
Assignee: Verizon Laboratories Inc
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Filing: 1988-10-03
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Granted: 1990-07-03
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Expires: 2008-10-03
Abstract
Abstract A composition for injection molding a ceramic powder to make ceramic shapes is described. The composition comprises a ceramic powder and a binder system. The binder system comprises a distilled thermosetting polycarbosilane containing from about 0.4 to about 0.7 weight percent of a cross-linking inhibitor, a surfactant, and with or without a lubricant. The cross-linking inhibitor is selected from the group consisting of p-benzoquinone, benzophenone, and mixtures thereof.
Inventors
- 👤 Sophia R. Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A composition for injection molding a ceramic powder to make ceramic shapes comprising a ceramic powder, said ceramic powder comprising approximately 92 weight percent silicon nitride, approximately 6 weight percent yttria and approximately 2 weight percent alumina, and a binder system, said binder system comprising a distilled thermosetting polycarbosilane containing from about 0.4 to about 0.7 weight percent of a cross-linking inhibitor selected from the group consisting of p-benzoquinone, benzophenone, and mixtures thereof, and a surfactant, said surfactant comprising oleic acid.
Claim 2
Dependent Claim
81 words
A composition for injection molding a ceramic powder to make ceramic shapes comprising a ceramic powder, said ceramic powder comprising approximately 92 weight percent silicon nitride, approximately 6 weight percent yttria and approximately 2 weight percent alumina, and a binder system, said binder system comprising a distilled thermosetting polycarbosilane containing from about 0.4 to about 0.7 weight percent of a cross-linking inhibitor selected from the group consisting of p-benzoquinone, benzophenone, and mixtures thereof, and a surfactant, said surfactant comprising oleic acid.
Claim 3
Dependent Claim
13 words
A composition in accordance with claim 1 wherein said cross-linking inhibitor comprises p-benzoquinone.
Claim 4
Dependent Claim
24 words
A composition in accordance with claim 1 wherein said cross-linking inhibitor comprises about 0.5 to about 0.7 weight percent of said distilled thermosetting polycarbosilane.
Claim 5
Dependent Claim
24 words
A composition in accordance with claim 1 wherein said binder system comprises about 37.4 volume percent to about 40.5 volume percent of said composition.
Claim 6
Dependent Claim
83 words
A composition for injection molding a ceramic powder to make ceramic shapes comprising a ceramic powder, said ceramic powder comprising approximately 92 weight percent silicon nitride, approximately 6 weight percent yttria and approximately 2 weight percent alumina, and a binder system, said binder system comprising a distilled thermosetting polycarbosilane containing from about 0.4 to about 0.7 weight percent of a cross-linking inhibitor selected from the group consisting of p-benzoquinone, benzophenone, and mixtures thereof, a surfactant, said surfactant comprising oleic acid and a lubricant.
Claim 7
Dependent Claim
83 words
A composition for injection molding a ceramic powder to make ceramic shapes comprising a ceramic powder, said ceramic powder comprising approximately 92 weight percent silicon nitride, approximately 6 weight percent yttria and approximately 2 weight percent alumina, and a binder system, said binder system comprising a distilled thermosetting polycarbosilane containing from about 0.4 to about 0.7 weight percent of a cross-linking inhibitor selected from the group consisting of p-benzoquinone, benzophenone, and mixtures thereof, a surfactant, said surfactant comprising oleic acid and a lubricant.
Claim 8
Dependent Claim
25 words
A composition in accordance with claim 5 wherein said lubricant comprises paraffin wax having a melting point in the range of 60° to 70° C.
Claim 9
Dependent Claim
13 words
A composition in accordance with claim 5 wherein said cross-linking inhibitor comprises p-benzoquinone.
Claim 10
Dependent Claim
24 words
A composition in accordance with claim 5 wherein said cross-linking inhibitor comprises about 0.5 to about 0.7 weight percent of said distilled thermosetting polycarbosilane.
Claim 11
Dependent Claim
24 words
A composition in accordance with claim 5 wherein said binder system comprises about 37.4 volume percent to about 40.5 volume percent of said composition.
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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |