US4737411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled pore size ceramics particularly for orthopaedic and dental applications
Assignee: University of Dayton
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Filing: 1986-11-25
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Granted: 1988-04-12
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Expires: 2006-11-25
Abstract
Abstract The present invention provides a ceramic composite having an open porous network and a controlled pore size comprising a plurality of ceramic particles having a fused glass coating and a method for producing the same. The ceramic particles are enveloped by and bonded to adjacent ceramic particles at their interfaces by the glass coating.
Inventors
- 👤 George A. Graves, Jr.
- 👤 Dale E. McCullum
- 👤 Steven M. Goodrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0007; A; A61; A61C; A61C8/00; A61C8/0012; A61C8/0013; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/70; A61K6/71; A61K6/74; A61K6/75; A61K6/80; A61K6/802; A61K6/807; A61K6/818; A61K6/831; A61K6/836; A61L; A61L27/00; A61L27/02; A61L27/10; A61L27/12; A61L27/50; A61L27/56; C03C3/00; C03C3/12; C03C3/16; C03C3/23; C03C3/247; C03C4/0014; C04; C04B; C04B32/00; C04B32/005; C04B38/00; C04B38/0038; A61F2/3094; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30242; A61F2230/00; A61F2230/0063; A61F2230/0071; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00293; A61F2310/00389; A61F2310/00928; C04B2111/00; C04B2111/00474; C04B2111/00836; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
56 words
A ceramic composite having an open porous network of a controlled pore size comprising a plurality of ceramic particles having a coating of a fused glass on their surfaces, said ceramic particles being bonded to adjacent ceramic particles at their interfaces by said fused glass coating to provide an open porous network between said ceramic particles.
Claim 2
Dependent Claim
56 words
A ceramic composite having an open porous network of a controlled pore size comprising a plurality of ceramic particles having a coating of a fused glass on their surfaces, said ceramic particles being bonded to adjacent ceramic particles at their interfaces by said fused glass coating to provide an open porous network between said ceramic particles.
Claim 3
Dependent Claim
30 words
The ceramic composite of claim 1 wherein said ceramic particles are a material selected from the group consisting of Al 2 O 3 , MgO, ZrO 2 , and SiC.
Claim 4
Dependent Claim
27 words
The ceramic composite of claim 1 wherein said ceramic composite is useful for dental and orthopaedic implants and said ceramic particles are a bone ingrowth promoting material.
Claim 5
Dependent Claim
17 words
The ceramic composite of claim 3 wherein said ceramic particles are a nonresorbable bone ingrowth promoting material.
Claim 6
Dependent Claim
26 words
The ceramic composite of claim 4 wherein said nonresorbable bone ingrowth promoting material is selected from the group consisting of hydroxyapatite, aluminum oxide, and pyrolytic carbon.
Claim 7
Dependent Claim
17 words
The ceramic composite of claim 3 wherein said ceramic particles are a resorbable bone ingrowth promoting material.
Claim 8
Dependent Claim
29 words
The ceramic composite of claim 6 wherein said resorbable bone ingrowth promoting material is selected from the group consisting of calcium aluminate, calcium phosphates, calcium aluminophosphates, and calcium sulfates.
Claim 9
Dependent Claim
20 words
The ceramic composite of claim 7 wherein said ceramic composite has a pore size of about 20 to 150 microns.
Claim 10
Dependent Claim
20 words
The ceramic composite of claim 8 wherein said ceramic composite has a pore size of at least about 100 microns.
Claim 11
Dependent Claim
11 words
The ceramic composite of claim 9 wherein said glass is resorbable.
Claim 12
Dependent Claim
22 words
The ceramic composite of claim 10 wherein said resorbable glass comprises calcium oxide (CaO) and phosphorus pentoxide (P 2 O 5 ).
Claim 13
Dependent Claim
48 words
The ceramic composite of claim 11 wherein said resorbable glass comprises by weight: ______________________________________
CaO 5-50%
P.sub.2 O.sub.5
50-95%
CaF.sub.2
0-5%
H.sub.2 O
0-5%
XO 0-10%
______________________________________ wherein XO is a metal oxide selected from the group consisting of magnesium, zinc, strontium, sodium, potassium, lithium, and aluminum oxides.
Claim 14
Dependent Claim
20 words
The ceramic composite of claim 12 wherein said ceramic particles have a particle size of less than about 2000 microns.
Claim 15
Dependent Claim
20 words
The ceramic composite of claim 13 wherein said ceramic particles have a particle size of about 500 to 1000 microns.
Claim 16
Dependent Claim
30 words
The ceramic composite of claim 14 wherein the ratio of said ceramic particles to said glass coating based on the weight of said ceramic material is about 8:1 to 14:1.
Claim 17
Dependent Claim
34 words
The ceramic composite of claim 15 wherein said ceramic material is formed by coating said ceramic particles with fusible glass particles, molding said fusible glass coated ceramic particles into a desired shape, and sintering.
Claim 18
Dependent Claim
24 words
The ceramic composite of claim 16 wherein said ceramic particles are coated with said fusible glass particles in an agglomerator or a spray dryer.
Claim 19
Dependent Claim
13 words
Ceramic particles having a coating of a fused glass on the surface thereof.
Claim 20
Dependent Claim
13 words
Ceramic particles having a coating of a fused glass on the surface thereof.
Claim 21
Dependent Claim
21 words
The ceramic particles of claim 18 wherein said glass comprises calcium oxide (CaO) and phosphorus pentoxide (P 2 O 5 ).
Claim 22
Dependent Claim
15 words
The ceramic particles of claim 19 wherein said particles are a bone ingrowth promoting material.
Claim 23
Dependent Claim
34 words
A process for preparing a ceramic composite having a controlled pore size comprising the steps of: coating ceramic particles with a glass, molding said glass coated ceramic particles into a desired shape, and sintering.
Claim 24
Dependent Claim
34 words
A process for preparing a ceramic composite having a controlled pore size comprising the steps of: coating ceramic particles with a glass, molding said glass coated ceramic particles into a desired shape, and sintering.
Claim 25
Dependent Claim
13 words
The process of claim 21 wherein said glass is a fusible glass powder.
Claim 26
Dependent Claim
23 words
The process of claim 22 wherein said ceramic particles are coated with said fusible glass particles in an agglomerator or a spray dryer.
Claim 27
Dependent Claim
11 words
The ceramic composite of claim 9 wherein said glass is non-resorbable.
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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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |