Patent US4530909A successfully refreshed from Google Patents.
US4530909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminosilicate glass containing Y2 O3 concentrate and ZrO2
Assignee: National Institute for Materials Science
•
Filing: 1984-10-19
•
Granted: 1985-07-23
•
Expires: 2004-10-19
Abstract
Abstract A process for preparing aluminosilicate glass comprising from 30 to 60 molar % of SiO2, from 20 to 35 molar % of Al2O3 and from 10 to 30 molar % of a total of rare earth oxides composed mainly of Y2O3, wherein an yttrium concentrate is used as the rare earth oxides composed mainly of Y2O3, and ZrO2 not in excess of 8 molar % to improve alkali resistance.
Inventors
- 👤 Akio Makishima
- 👤 Tatsuya Nagata
- 👤 Takajiro Shimohira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002; C03C3/00; C03C3/04; C03C3/062
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
An aluminosilicate glass consisting of 30 to 60 molar % of SiO 2 , 20 to 35 molar % of Al 2 O 3 , 10 to 30 molar % of an yttrium concentrate composed essentially of Y 2 O 3 and the rare earth oxides present in a crude ore of Y 2 O 3 , the concentrate being composed mainly of Y 2 O 3 , and 5-8 molar % of ZrO 2 .
Claim 2
Dependent Claim
76 words
An aluminosilicate glass consisting of 30 to 60 molar % of SiO 2 , 20 to 35 molar % of Al 2 O 3 , 10 to 30 molar % of an yttrium concentrate composed essentially of Y 2 O 3 and the rare earth oxides present in a crude ore of Y 2 O 3 , the concentrate being composed mainly of Y 2 O 3 , and 5-8 molar % of ZrO 2 .
Claim 3
Dependent Claim
117 words
An aluminosilicate glass consisting of 30 to 60 molar % of SiO 2 , 30 to 35 molar % of Al 2 O 3 , 10 to 30 molar % of an yttrium concentrate composed essentially of Y 2 O 3 and the rare earth oxides present in a crude ore of Y 2 O 3 , the concentrate being composed mainly of Y 2 O 3 and an effective amount, not to exceed 8 molar %, of ZrO 2 for improving the chemical resistance of the glass in powder form, over a same glass absent ZrO 2 , when maintained in an aqueous solution of 2N NaOH at 95° C. for a period of 10 days.
Claim 4
Dependent Claim
117 words
An aluminosilicate glass consisting of 30 to 60 molar % of SiO 2 , 30 to 35 molar % of Al 2 O 3 , 10 to 30 molar % of an yttrium concentrate composed essentially of Y 2 O 3 and the rare earth oxides present in a crude ore of Y 2 O 3 , the concentrate being composed mainly of Y 2 O 3 and an effective amount, not to exceed 8 molar %, of ZrO 2 for improving the chemical resistance of the glass in powder form, over a same glass absent ZrO 2 , when maintained in an aqueous solution of 2N NaOH at 95° C. for a period of 10 days.
References Cited (Backward Citations)
US3573078A
Cited
US3804646A
Cited
US3957500A
Cited
US4088023A
Cited
JPS53137218A
Cited
JPS582234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |