US4062689A
Expired / Lapsed
US
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Glass composition which is resistant to alkali
Assignee: AGC Inc
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Filing: 1976-04-01
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Granted: 1977-12-13
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Expires: 1996-04-01
Abstract
Abstract A glass composition which possesses a chemical resistance. The glass composition consists essentially of SiO 2 : 45 - 65 wt.% ZrO 2 : 10 - 20 wt.% Cr 2 O 3 : 0 - 5 wt.% SnO 2 : 0 - 5 wt.% Ro: 0 - 18 wt.% R' 2 o: 0 - 18 wt.% So 3 : 0.05 - 1 wt.% Wherein the sum of contents of Cr 2 O 3 + SnO 2 is 0.5 - 10 wt.%; the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12 - 25 wt.%; RO is selected from the group consisting of CaO, MgO, ZnO, BaO, and SrO; and R' 2 O is selected from the group consisting of K 2 O of 0 - 5 wt.%, Na 2 O of 0 - 18 wt.% and Li 2 O of 0 - 5 wt.%.
Inventors
- 👤 Yoshiro Suzuki
- 👤 Hironori Ohta
- 👤 Masuo Shirasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:38
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002; C03C3/00; C03C3/04; C03C3/076; C03C3/078
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A glass composition consisting of SiO 2 :45-65 wt.% ZrO 2 :10-20 wt.% Cr 2 O 3 :0-5 wt.% SnO 2 :0-5 wt.% Ro:0-18 wt.% R' 2 o:0-18 wt.% So 3 :0.05-1 wt.% and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of Cr 2 O 3 + SnO 2 is 0.5-10 wt.% and the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12-25 wt.% and RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO; and R' 2 O is selected from the group consisting of K 2 O of 0-5 wt.%, Na 2 O of 0-18 wt.% and Li 2 O of 0-5 wt.%.
Claim 2
Dependent Claim
124 words
A glass composition consisting of SiO 2 :45-65 wt.% ZrO 2 :10-20 wt.% Cr 2 O 3 :0-5 wt.% SnO 2 :0-5 wt.% Ro:0-18 wt.% R' 2 o:0-18 wt.% So 3 :0.05-1 wt.% and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of Cr 2 O 3 + SnO 2 is 0.5-10 wt.% and the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12-25 wt.% and RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO; and R' 2 O is selected from the group consisting of K 2 O of 0-5 wt.%, Na 2 O of 0-18 wt.% and Li 2 O of 0-5 wt.%.
Claim 3
Dependent Claim
106 words
A glass composition consisting SiO 2 :45-65 wt.% ZrO 2 :10-20 wt.% Cr 2 O 3 :0-5 wt.% SnO 2 :0.5-5 wt.% Ro:0-15 wt.% R' 2 o:5-18 wt.% So 3 :0.05-1 wt.% and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12-25 wt.%; RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO and R' 2 O is selected from the group consisting of K 2 O of 0-5 wt.%, Na 2 O of 5-18 wt.% and Li 2 O of 0-5 wt.%.
Claim 4
Dependent Claim
106 words
A glass composition consisting SiO 2 :45-65 wt.% ZrO 2 :10-20 wt.% Cr 2 O 3 :0-5 wt.% SnO 2 :0.5-5 wt.% Ro:0-15 wt.% R' 2 o:5-18 wt.% So 3 :0.05-1 wt.% and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12-25 wt.%; RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO and R' 2 O is selected from the group consisting of K 2 O of 0-5 wt.%, Na 2 O of 5-18 wt.% and Li 2 O of 0-5 wt.%.
Claim 5
Dependent Claim
115 words
A glass composition consisting of SiO 2 :45-65 wt.% ZrO 2 :10-20 wt.% Cr 2 O 3 :0.5-5 wt.% SnO 2 :0.5-5 wt.% Ro:5-15 wt.% R' 2 o:5 - 15 wt.% So 3 :0.05 - 1 wt.% and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12 - 25 wt.%, RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO and R' 2 O is selected from the group consisting of K 2 O of 0-3 wt.%, Na 2 O of 5-15 wt.% and Li 2 O of 0 - 3 wt.%.
Claim 6
Dependent Claim
115 words
A glass composition consisting of SiO 2 :45-65 wt.% ZrO 2 :10-20 wt.% Cr 2 O 3 :0.5-5 wt.% SnO 2 :0.5-5 wt.% Ro:5-15 wt.% R' 2 o:5 - 15 wt.% So 3 :0.05 - 1 wt.% and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of ZrO 2 + SnO 2 + Cr 2 O 3 is 12 - 25 wt.%, RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO and R' 2 O is selected from the group consisting of K 2 O of 0-3 wt.%, Na 2 O of 5-15 wt.% and Li 2 O of 0 - 3 wt.%.
Claim 7
Dependent Claim
11 words
A glass fiber made of the glass composition of claim 1.
Claim 8
Dependent Claim
11 words
A glass fiber made of the glass composition of claim 3.
Claim 9
Dependent Claim
22 words
In a cement product comprising a Portland cement and a glass fiber, the improvement which comprises the glass fiber of claim 4.
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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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |