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US4265667A Expired / Lapsed US ⏱️ 0.0 years remaining

Step-type light-transmitting body having excellent water resistance

Assignee: Nippon Sheet Glass Co Ltd
•
Filing: 1980-04-25
•
Granted: 1981-05-05
•
Expires: 2000-04-25
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Abstract

Abstract A step-type light-transmitting body having excellent water resistance, said light-transmitting body comprising a core material of a glass having the following composition in % by weight: (1) SiO 2 15-40, (2) ZrO 2 8-17, (3) B 2 O 3 5-15, (4) BaO 30-45, (5) Na 2 O 3-15, as essential ingredients, and (6) GeO 2 0-30, TiO 2 0-3, Al 2 O 3 0-5, La 2 O 3 0-5, MgO 0-5, CaO 0-7, ZnO 0-7, SrO 0-5, Li 2 O 0-8, K 2 O 0-10, Rb 2 O 0-5, and Cs 2 O 0-8, as additional ingredients; provided that SiO 2 +GeO 2 15-50, ZrO 2 +BaO 38-55, Na 2 O+Li 2 O+K 2 O+Rb 2 O+Cs 2 O 5-15, and MgO+CaO+ZnO+SrO+TiO 2 +Al 2 O 3 +La 2 O 3 0-12. In the above composition, the amounts of (2) ZrO 2 , (3) B 2 O 3 , (5) Na 2 O and ZrO 2 + BaO may be changed to 8-15, 7-12, 5-12, and 38-50, respectively.

Inventors

  • 👤 Yoshirou Ikeda
  • 👤 Yoshikazu Kaite

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 23:15
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; C03C13/046

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 106 words
A step-type light-transmitting body having excellent water resistance, said light-transmitting body comprising a core material of a glass having a refractive index of 1.60 to 1.66 and the following composition in % by weight: ______________________________________ (1) SiO.sub.2 15-40, (2) ZrO.sub.2 8-15, (3) B.sub.2 O.sub.3 7-12, (4) BaO 30-45, (5) Na.sub.2 O 5-12, (6) GeO.sub.2 0-30, TiO.sub.2 0-3, Al.sub.2 O.sub.3 0-5, La.sub.2 O.sub.3 0-5, MgO 0-5, CaO 0-7, ZnO 0-7, SrO 0-5, Li.sub.2 O 0-8, K.sub.2 O 0-10, Rb.sub.2 O 0-5, and Cs.sub.2 O 0-8; provided that SiO.sub.2 +GeO.sub.2 15-50, ZrO.sub.2 +BaO 38-50, Na.sub.2 O+Li.sub.2 O+K.sub.2 O+Rb.sub.2 O+Cs.sub.2 O 5-15, and MgO+CaO+ZnO+SrO+TiO.sub.2 +Al.sub.2 O.sub.3+La.sub.2 O.sub.3 0-12. ______________________________________
Claim 2
Dependent Claim 106 words
A step-type light-transmitting body having excellent water resistance, said light-transmitting body comprising a core material of a glass having a refractive index of 1.60 to 1.66 and the following composition in % by weight: ______________________________________ (1) SiO.sub.2 15-40, (2) ZrO.sub.2 8-15, (3) B.sub.2 O.sub.3 7-12, (4) BaO 30-45, (5) Na.sub.2 O 5-12, (6) GeO.sub.2 0-30, TiO.sub.2 0-3, Al.sub.2 O.sub.3 0-5, La.sub.2 O.sub.3 0-5, MgO 0-5, CaO 0-7, ZnO 0-7, SrO 0-5, Li.sub.2 O 0-8, K.sub.2 O 0-10, Rb.sub.2 O 0-5, and Cs.sub.2 O 0-8; provided that SiO.sub.2 +GeO.sub.2 15-50, ZrO.sub.2 +BaO 38-50, Na.sub.2 O+Li.sub.2 O+K.sub.2 O+Rb.sub.2 O+Cs.sub.2 O 5-15, and MgO+CaO+ZnO+SrO+TiO.sub.2 +Al.sub.2 O.sub.3+La.sub.2 O.sub.3 0-12. ______________________________________

References Cited (Backward Citations)

GB1108509A Cited
US4094689A Cited
US4179300A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-05-04 1984-11-03 1985-05-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-05-04 1988-11-03 1989-05-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-05-04 1992-11-03 1993-05-05 $7700.00 Window Closed / Lapsed

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