Patent US4236930A successfully refreshed from Google Patents.
US4236930A
Expired / Lapsed
US
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Optical waveguide and method and compositions for producing same
Assignee: Individual
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Filing: 1978-06-09
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Granted: 1980-12-02
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Expires: 1998-06-09
Abstract
Abstract The present invention relates to a glass composition for forming glass articles suitable for forming or being converted to articles or devices for use in the guided transmission of light, for both imaging and communications purposes. Base glass compositions are purified by phase separation, leached to remove impurities, and dopants are then deposited into interconnected pores of porous glass in such a fashion that properties of the glass are varied, e.g., for optical purposes, the index of refraction is controlled.
Inventors
- 👤 Pedro B. Macedo
- 👤 Theodore A. Litovitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:16
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C23/00; C03C23/0095
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
145 words
A glass article having a least dimension of 4 millimeters and having a composition consisting essentially of the following components on a mole percent bases: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of K 2 O, Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C. whereby said article withstands conventional acid leaching without cracking.
Claim 2
Dependent Claim
145 words
A glass article having a least dimension of 4 millimeters and having a composition consisting essentially of the following components on a mole percent bases: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of K 2 O, Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C. whereby said article withstands conventional acid leaching without cracking.
Claim 3
Dependent Claim
19 words
A glass article as claimed in claim 1 where the range of R 2 O is 6.5-8 mole percent.
Claim 4
Dependent Claim
22 words
A glass article as claimed in claim 1 where R 2 O consists of Na 2 O and K 2 O only.
Claim 5
Dependent Claim
20 words
A glass article as claimed in claim 1 where the range of B 2 O 3 is 33-37 mole percent.
Claim 6
Dependent Claim
32 words
A glass article as claimed in claim 1 having the composition 56 SiO 2 , 36 B 2 O 3 , 4 K 2 O and 4 Na 2 O mole percent.
Claim 7
Dependent Claim
23 words
A glass article as claimed in claim 1 where the concentration of SiO 2 is in the range 49.5 to 59 mole percent.
Claim 8
Dependent Claim
17 words
A glass article as claimed in claim 1 where the smallest dimension is at least 8 millimeters.
Claim 9
Dependent Claim
22 words
A glass article as claimed in claim 1 where the composition has a coexistence temperature T p between 695° and 640° C.
Claim 10
Dependent Claim
17 words
A glass article as claimed in claim 1 where the article is an unleached fiber optic preform.
Claim 11
Dependent Claim
177 words
A glass article having a least dimension of 4 millimeters and having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
0-3% Al.sub.2 O.sub.3
______________________________________ said composition having the following parameters: ρ0.2-0.8; α0-3; x 0.2-1.0 where α is the Al 2 O 3 concentration in mole percent, ×=β+(1/3) α and ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of K 2 O, Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition having a coexistence temperature T p between 695° and 640° C. and exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C. whereby said article withstands conventional acid leaching without cracking.
Claim 12
Dependent Claim
177 words
A glass article having a least dimension of 4 millimeters and having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
0-3% Al.sub.2 O.sub.3
______________________________________ said composition having the following parameters: ρ0.2-0.8; α0-3; x 0.2-1.0 where α is the Al 2 O 3 concentration in mole percent, ×=β+(1/3) α and ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of K 2 O, Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition having a coexistence temperature T p between 695° and 640° C. and exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C. whereby said article withstands conventional acid leaching without cracking.
Claim 13
Dependent Claim
19 words
A glass article as claimed in claim 10 where the range of R 2 O is 6.5-8 mole percent.
Claim 14
Dependent Claim
22 words
A glass article as claimed in claim 10 where R 2 O consists of Na 2 O and K 2 O only.
Claim 15
Dependent Claim
20 words
A glass article as claimed in claim 10 where the range of B 2 O 3 is 33-37 mole percent.
Claim 16
Dependent Claim
35 words
A glass article as claimed in claim 10 where the concentration of Al 2 O 3 , α, is greater than 0.5, and R 2 O is in the range 6 to 9 mole percent.
Claim 17
Dependent Claim
23 words
A glass article as claimed in claim 10 where the concentration of SiO 2 is in the range 49.5 to 59 mole percent.
Claim 18
Dependent Claim
145 words
A glass article having a least dimension of 4 millimeters and having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
49.5-59% SiO.sub.2
28-42% B.sub.2 O.sub.3
6.5-8% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of K 2 O, Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C. whereby said article withstands conventional acid leaching without cracking.
Claim 19
Dependent Claim
145 words
A glass article having a least dimension of 4 millimeters and having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
49.5-59% SiO.sub.2
28-42% B.sub.2 O.sub.3
6.5-8% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of K 2 O, Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C. whereby said article withstands conventional acid leaching without cracking.
Claim 20
Dependent Claim
17 words
A glass article as claimed in claim 16 where the article is an unleached fiber optic preform.
Claim 21
Dependent Claim
16 words
The glass article claimed in claim 16 where the least dimension is at least 8 mm.
Claim 22
Dependent Claim
126 words
A glass article having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio of A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C.
Claim 23
Dependent Claim
126 words
A glass article having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio of A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C.
Claim 24
Dependent Claim
16 words
The glass article claimed in claim 19 where the article is an unleached fiber optic preform.
Claim 25
Dependent Claim
122 words
A glass article having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C.
Claim 26
Dependent Claim
122 words
A glass article having a composition consisting essentially of the following components on a mole percent basis: ______________________________________
48-64% SiO.sub.2
28-42% B.sub.2 O.sub.3
4-9% R.sub.2 O
______________________________________ said composition having the following parameters: ρ0.2-0.8 where ρ is defined as the ratio A 2 O/R 2 O for A 2 O and R 2 O in mole percent, A 2 O is the sum of the concentrations in mole percent of Rb 2 O and Cs 2 O, and R 2 O is the sum of the concentrations in mole percent of Na 2 O, Rb 2 O, and Cs 2 O, said composition exhibiting an equilibrium volume fraction of about 50% at a temperature within the range of 500° to 575° C.
Claim 27
Dependent Claim
17 words
The glass article claimed in claim 21 in which the article is an unleached fiber optic preform.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |