Patent US149969A successfully refreshed from Google Patents.
Patent US4329271A successfully refreshed from Google Patents.
US4329271A
Expired / Lapsed
US
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Flexible ceramic tape and method of making same
Assignee: Osram Sylvania Inc
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Filing: 1980-12-15
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Granted: 1982-05-11
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Expires: 2000-12-15
Abstract
Abstract An improved flexible ceramic tape consists essentially of ceramic powder and a water soluble binder of polyacrylic acid polymer and glycerol. Additions of small amounts of polyvinyl pyrrolidine to this binder improves the flexibility of the resulting tape. The ceramic powder consists of alumina. The invention also comprehends the method of making this tape consisting of the steps of preparing a slip or mixture of an aqueous solution of polyacrylic acid polymer and glycerol together with the ceramic powder, casting this slip on a substrate to a predetermined uniform thickness, and drying the mixture. The tape may be removed from the substrate or allowed to remain mounted on it.
Inventors
- 👤 Miro Kemr
- 👤 Howard Mizuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:07
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/05; C08K5/053
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
A flexible ceramic composition consisting, in dry weight, of 2-4% polyacrylic acid polymer having a molecular weight of approximately 450,000, 9-14% glycerol and the balance a ceramic substance consisting of alumina.
Claim 2
Dependent Claim
31 words
A flexible ceramic composition consisting, in dry weight, of 2-4% polyacrylic acid polymer having a molecular weight of approximately 450,000, 9-14% glycerol and the balance a ceramic substance consisting of alumina.
Claim 3
Dependent Claim
29 words
A flexible ceramic composition consisting, in dry weight, of 2-4% polyacrylic acid polymer having a molecular weight of approximately 450,000, 9-14% glycerol, 0.5-2% polyvinyl pyrrolidine, and the balance alumina.
Claim 4
Dependent Claim
29 words
A flexible ceramic composition consisting, in dry weight, of 2-4% polyacrylic acid polymer having a molecular weight of approximately 450,000, 9-14% glycerol, 0.5-2% polyvinyl pyrrolidine, and the balance alumina.
Claim 5
Independent Claim
62 words
The method of preparing a flexible ceramic tape consisting of the steps of preparing a mixture consisting of an aqueous solution of, in dry weight, 2% to 4% polyacrylic acid polymer having a molecular weight of approximately 450,000 and 9% to 14% glycerol and the balance alumina powder, casting said mixture to a uniform thickness on a substrate, and drying said mixture.
Claim 6
Independent Claim
62 words
The method of preparing a flexible ceramic tape consisting of the steps of preparing a mixture consisting of an aqueous solution of, in dry weight, 2% to 4% polyacrylic acid polymer having a molecular weight of approximately 450,000 and 9% to 14% glycerol and the balance alumina powder, casting said mixture to a uniform thickness on a substrate, and drying said mixture.
Claim 7
Independent Claim
68 words
The method of preparing a flexible ceramic tape consisting of the steps of preparing a mixture consisting of an aqueous solution of, in dry weight, 2% to 4% polyacrylic acid polymer having a molecular weight of approximately 450,000 and 9% to 14% glycerol and 0.5% to 2.0% polyvinyl pyrrolidine and the balance alumina powder, casting said mixture to a uniform thickness on a substrate, and drying said mixture.
Claim 8
Independent Claim
68 words
The method of preparing a flexible ceramic tape consisting of the steps of preparing a mixture consisting of an aqueous solution of, in dry weight, 2% to 4% polyacrylic acid polymer having a molecular weight of approximately 450,000 and 9% to 14% glycerol and 0.5% to 2.0% polyvinyl pyrrolidine and the balance alumina powder, casting said mixture to a uniform thickness on a substrate, and drying said mixture.
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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |