Patent US3977404A successfully refreshed from Google Patents.
US5034352A
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US
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Calcium phosphate materials
Assignee: LIFE CORE BIOMEDICAL Inc
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Filing: 1990-03-12
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Granted: 1991-07-23
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Expires: 2010-03-12
Abstract
Abstract The invention disclosed by this application relates to a novel method of processing sinterable powders into sintered ceramic products. This application also relates to novel forms of aluminum oxide, hydroxylapatite, and tricalcium phosphate ceramic products prepared in accordance with the method of this invention, as well as novel intermediate products useful to prepare the novel ceramic products of this invention.
Inventors
- 👤 Jaroslay Vit
- 👤 Ronald L. Salsbury
- 👤 Don J. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:58
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; A; A61; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/70; A61K6/71; A61K6/74; A61K6/75; A61K6/80; A61K6/884; A61K6/898; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/50; A61L27/56; C04B35/01; C04B35/447; C08; C08L; C08L3/00; C08L3/02; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
Ceramic particles of a calcium phosphate material suitable as an implant or prosthesis material, said particles being sintered agglomerate particles characterized by a bulk particle density of 80-95%, a size range of between 20 and 80 mesh and a network of micropores in the individual particles sufficient to permit tissue attachment when the particles are employed as a tissue implant or prosthesis material, the pores having a maximum pore size of about 50 microns and an average pore size of about 1.5 microns.
Claim 2
Dependent Claim
83 words
Ceramic particles of a calcium phosphate material suitable as an implant or prosthesis material, said particles being sintered agglomerate particles characterized by a bulk particle density of 80-95%, a size range of between 20 and 80 mesh and a network of micropores in the individual particles sufficient to permit tissue attachment when the particles are employed as a tissue implant or prosthesis material, the pores having a maximum pore size of about 50 microns and an average pore size of about 1.5 microns.
Claim 3
Dependent Claim
26 words
Ceramic particles as in claim 1 wherein said network of micropores is comprised of micropores about 90% of which have a pore diameter below 0.3 microns.
Claim 4
Dependent Claim
13 words
Ceramic particles as in claim 1 wherein the calcium phosphate material is hydroxylapatite.
Claim 5
Dependent Claim
15 words
Ceramic particles as in claim 1 wherein the particles are in the 10-60 mesh range.
Claim 6
Dependent Claim
12 words
Ceramic particles as in claim 1 characterized by a substantially spheroidal shape.
Claim 7
Dependent Claim
74 words
Ceramic particles of a calcium phosphate material suitable as an implant or prosthesis material, said particles being sintered agglomerate particles characterized by a bulk particle density of 80-95%, a size range of between 20 and 80 mesh and a network of micropores in the individual particles sufficient to permit tissue attachment when the particles are employed as a tissue implant or prosthesis material, the pores having an average pore size of about 1.5 microns.
Claim 8
Dependent Claim
74 words
Ceramic particles of a calcium phosphate material suitable as an implant or prosthesis material, said particles being sintered agglomerate particles characterized by a bulk particle density of 80-95%, a size range of between 20 and 80 mesh and a network of micropores in the individual particles sufficient to permit tissue attachment when the particles are employed as a tissue implant or prosthesis material, the pores having an average pore size of about 1.5 microns.
Claim 9
Dependent Claim
13 words
Ceramic particles as in claim 6 wherein the calcium phosphate material is hydroxylapatite.
Claim 10
Dependent Claim
15 words
Ceramic particles as in claim 6 wherein the particles are in the 10-60 mesh range.
Claim 11
Dependent Claim
12 words
Ceramic particles as in claim 6 characterized by a substantially spheroidal shape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |