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US3901719A Expired / Lapsed US ⏱️ 0.0 years remaining

Glasses and glass-ceramics containing rutile fibers

Assignee: Corning Glass Works
•
Filing: 1974-05-22
•
Granted: 1975-08-26
•
Expires: 1994-05-22
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Abstract

Abstract This invention is concerned with the production of composite articles comprising a glass or glass-ceramic matrix containing long fibrous single crystals of rutile (TiO2) of very high aspect ratios grown in situ. The glass articles are formed via the heat treatment of a molten batch consisting essentially, by weight on the oxide basis, of about 45-65% B2O3, 0-30 percent Al2O3, 5-30% TiO2, and 3-30% alkaline earth metal oxides and can exhibit greatly improved mechanical strength and toughness when compared with the original, or fiber-free, glass. The glass-ceramic articles are formed by heat treating the fiber-containing glass in a particular manner to cause the development of fine-grained crystals in situ, resulting in a highly-crystalline article containing long fibrous single crystals of rutile exhibiting very high aspect ratios.

Inventors

  • 👤 Iii William T Brydges
  • 👤 Dennis W Smith

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 13:33
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/002; C03C10/00; C03C10/0054; C03C2214/00; C03C2214/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 69 words
A COMPOSITE ARTICLE CONSISTING ESSENTIALLY OF LONG SINGLE CRYSTAL RUTILE FIBERS OF HIGH ASPECT RATIONS CONTAINED WITHIN A QUATERNARY RO-TIO2O3-B2O3 GLASS MATRIX, SAID ARTICLE EXHIBITING CHEMICAL DURABILITY AND HAVING AN OVERALL COMPOSITION CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIC, OF ABOUT 45-65% B2O3, 5-30% AL2O3, 5-30% TIO2, AND 3-30% RO, WHEREIN RO CONSISTS OF AN ALKALINE EARTH METAL OXIDE SELECTED FROM THE GROUP MGO, CAO, SRO, AND BAO.
Claim 2
Dependent Claim 69 words
A COMPOSITE ARTICLE CONSISTING ESSENTIALLY OF LONG SINGLE CRYSTAL RUTILE FIBERS OF HIGH ASPECT RATIONS CONTAINED WITHIN A QUATERNARY RO-TIO2O3-B2O3 GLASS MATRIX, SAID ARTICLE EXHIBITING CHEMICAL DURABILITY AND HAVING AN OVERALL COMPOSITION CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIC, OF ABOUT 45-65% B2O3, 5-30% AL2O3, 5-30% TIO2, AND 3-30% RO, WHEREIN RO CONSISTS OF AN ALKALINE EARTH METAL OXIDE SELECTED FROM THE GROUP MGO, CAO, SRO, AND BAO.
Claim 3
Dependent Claim 30 words
A composite article according to claim 1 wherein said fibers range up to about 0.5 inch in length and 0.004 inch in width, with aspect ratios up to about 200:1.
Claim 4
Dependent Claim 28 words
A composite article according to claim 2 wherein said fibers range between about 0.1-0.4 inch in length and 0.001-0.004 inch in width, with aspect ratios between about 50-100:1.
Claim 5
Dependent Claim 21 words
A composite article according to claim 1 wherein said composition is essentially free from SiO2, P2O5, F, Li2O, Na2O, and K2O.
Claim 6
Dependent Claim 23 words
A composite article according to claim 1 wherein said composition consists essentially of about 50-65% B2O3, 15-25% Al2O3, 5-20% TiO2, and 3-15% RO.

References Cited (Backward Citations)

US2920971A Cited
US3065091A Cited
US3236686A Cited
US3479137A Cited
US3758705A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-08-25 1979-02-24 1979-08-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-08-25 1983-02-24 1983-08-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-08-25 1987-02-24 1987-08-26 $7700.00 Window Closed / Lapsed

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