Patent US2552626A successfully refreshed from Google Patents.
US4786555A
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US
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Support particles coated with or particles of precursors for or of biologically active glass
Assignee: EIDP Inc
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Filing: 1986-06-09
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Granted: 1988-11-22
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Expires: 2006-06-09
Abstract
Abstract An aqueous solution of precursors for biologically active glass, support particles coated with the solution, support particles coated with the glass, spheroidal particles of biologically active glass, processes for making the solution, coating the support, and for making the coated support and the spheroidal glass particles. The materials that comprise the biologically active glass are useful in prosthetic devices and implants for the human body.
Inventors
- 👤 Edward G. Howard, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0007; A; A61; A61L; A61L27/00; A61L27/02; A61L27/10; A61L27/12; C03C1/00; C03C12/00; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/089; C03C3/097; C03C3/11; C03C3/112; C03C3/115; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; Y; Y10; Y10S; Y10S623/00; Y10S623/924; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A method for making particles of biologically active glass comprising spray-drying an aqueous acid solution showing no substantial amount of precipitation in one hour consisting essentially of precursors that correspond to components of the glass and firing the spray-dried particles to convert the glass precursors to glass, the glass consisting essentially of the components: SiO 2 , 40 to 62 weight percent; Na 2 O, 10 to 32 weight percent; CaO, 10 to 32 weight percent; CaF 2 , 0 to 18 weight percent; P 2 O 5 , 0.1 to 12 weight percent; and B 2 O 3 , 0 to 20 weight percent; wherein Na 2 O and CaO taken together, are at least about 30 weight percent.
Claim 2
Independent Claim
120 words
A method for making particles of biologically active glass comprising spray-drying an aqueous acid solution showing no substantial amount of precipitation in one hour consisting essentially of precursors that correspond to components of the glass and firing the spray-dried particles to convert the glass precursors to glass, the glass consisting essentially of the components: SiO 2 , 40 to 62 weight percent; Na 2 O, 10 to 32 weight percent; CaO, 10 to 32 weight percent; CaF 2 , 0 to 18 weight percent; P 2 O 5 , 0.1 to 12 weight percent; and B 2 O 3 , 0 to 20 weight percent; wherein Na 2 O and CaO taken together, are at least about 30 weight percent.
Claim 3
Dependent Claim
11 words
Biologically active glass particles made by the method of claim 1.
Claim 4
Dependent Claim
14 words
A spheroidal particle of biologically active glass made by the method of claim 1.
Claim 5
Dependent Claim
15 words
A biomedical device comprising a uniform, homogeneous, body-compatible matrix of particles according to claim 2.
Claim 6
Dependent Claim
15 words
A biomedical device comprising a uniform, homogeneous, body-compatible matrix of particles according to claim 3.
Claim 7
Dependent Claim
107 words
A spray-dried particle made from an aqueous acid solution showing no substantial amount of precipitation in one hour consisting essentially of biologically active glass precursors that correspond to components of a biologically active glass, the glass consisting essentially of the components: SiO 2 , 40 to 62 weight percent; Na 2 O, 10 to 32 weight percent; CaO, 10 to 32 weight percent; CaF 2 , 0 to 18 weight percent; P 2 O 5 , 0.1 to 12 weight percent; and B 2 O 3 , 0 to 20 weight percent; wherein Na 2 O and CaO taken together, are at least about 30 weight percent.
Claim 8
Dependent Claim
107 words
A spray-dried particle made from an aqueous acid solution showing no substantial amount of precipitation in one hour consisting essentially of biologically active glass precursors that correspond to components of a biologically active glass, the glass consisting essentially of the components: SiO 2 , 40 to 62 weight percent; Na 2 O, 10 to 32 weight percent; CaO, 10 to 32 weight percent; CaF 2 , 0 to 18 weight percent; P 2 O 5 , 0.1 to 12 weight percent; and B 2 O 3 , 0 to 20 weight percent; wherein Na 2 O and CaO taken together, are at least about 30 weight percent.
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |