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US3981736A Expired / Lapsed US ⏱️ 0.0 years remaining

Biocompatible glass ceramic material

Assignee: Ernst Leitz Wetzlar GmbH
•
Filing: 1975-05-12
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Granted: 1976-09-21
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Expires: 1995-05-12
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Abstract

Abstract The glass ceramic material of the present invention has the following composition, in weight percent,: About 20 to about 60 percent of silicon dioxide SiO 2 , about 5 to about 40 percent of phosphorus pentoxide P 2 O 5 , about 2.7 to about 20 percent of sodium oxide Na 2 O, about 0.4 to about 20 percent of potassium oxide K 2 O, about 2.9 to about 30 percent of magnesium oxide MgO, and About 5 to about 40 percent of calcium oxide CaO, and may contain between About 0.5 and about 3.0 percent of fluorine. The glass ceramic material is produced by melting the mixture of components and subjecting the resulting melt to a specific annealing or tempering treatment to cause formation of nuclei and ceramization. Such glass ceramic material is especially useful as bone and tooth replacement material in humans and animals.

Inventors

  • 👤 Heinz Broemer
  • 👤 Hans-Herbert Kaes
  • 👤 Emanuel Pfeil

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 04:48
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; C; C03; C03C; C03C10/00; C03C10/0009; C03C21/00; C03C21/001; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 101 words
An apatite-containing glass ceramic material of satisfactory biocompatibility, said material being formed by thermal crystallization of a glass consisting essentially, in weight percent, of Between about 20 and about 60 percent of silicon dioxide SiO 2 , between about 5 and about 40 percent of phosphorus pentoxide P 2 O 5 , between about 2.7 and about 20 percent of sodium oxide Na 2 O, between about 0.4 and about 20 percent of potassium oxide K 2 O, between about 2.9 and about 30 percent of magnesium oxide MgO, and between about 5 and about 40 percent of calcium oxide CaO.
Claim 2
Dependent Claim 101 words
An apatite-containing glass ceramic material of satisfactory biocompatibility, said material being formed by thermal crystallization of a glass consisting essentially, in weight percent, of Between about 20 and about 60 percent of silicon dioxide SiO 2 , between about 5 and about 40 percent of phosphorus pentoxide P 2 O 5 , between about 2.7 and about 20 percent of sodium oxide Na 2 O, between about 0.4 and about 20 percent of potassium oxide K 2 O, between about 2.9 and about 30 percent of magnesium oxide MgO, and between about 5 and about 40 percent of calcium oxide CaO.
Claim 3
Dependent Claim 19 words
The material of claim 1, additionally containing between about 0.05 and about 3.0 percent of fluorine F 2 .
Claim 4
Dependent Claim 88 words
The material of claim 1, essentially consisting, in weight percent, of: Between about 30 and about 60 percent of silicon dioxide SiO 2 , between about 5 and about 20 percent of phosphorus pentoxide P 2 O 5 , between about 3 and about 10 percent of sodium oxide Na 2 O, between about 3 and about 10 percent of potassium oxide K 2 O, between about 5 and about 20 percent of magnesium oxide MgO, and between about 10 and about 30 percent of calcium oxide CaO.
Claim 5
Dependent Claim 19 words
The material of claim 3, additionally containing between about 0.5 and about 2.5 percent of fluorine F 2 .

References Cited (Backward Citations)

US3787900A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-09-21 1980-03-22 1980-09-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-09-21 1984-03-22 1984-09-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-09-21 1988-03-22 1988-09-21 $7700.00 Window Closed / Lapsed

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