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US4055435A
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Glass compositions for ophthalmic lenses
Assignee: Hoya Glass Works Ltd
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Filing: 1976-06-02
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Granted: 1977-10-25
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Expires: 1996-06-02
Abstract
Abstract A glass composition for an ophthalmic lens having a refractive index of at least 1.69, an Abbe value of at least 39 and a specific gravity of not more than 3.2 and comprising, in percent by weight:
Inventors
- 👤 Hiroji Sagara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:04
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/062; C03C3/064; C03C3/083; C03C3/085; C03C3/087; C03C3/089; C03C3/091; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A glass composition for an ophthalmic lens having a refractive index of at least 1.69, an Abbe value of at least 39 and a specific gravity of not more than 3.2 and consisting essentially of, in percent by weight: 1. 42 to 52 SiO 2 +Al 2 O 3 +B 2 O 3 with 20 to 42 SiO 2 , 5 to 13 Al 2 O 3 and 0 to 20 B 2 O 3 ; 2. 22 to 39 CaO+MgO with 12 to 39 CaO and 0 to 20 MgO; 3. 15 to 28 ZrO 2 +TiO 2 +Nb 2 O 5 with 0 to 7 ZrO 2 , 5 to 13 TiO 2 and 0 to 15 Nb 2 O 5 ; 4. 0 to 15 BaO+SrO+ZnO with 0 to 6 BaO, 0 to 10 SrO and 0 to 15 ZnO; and 5. 0 to 10 La 2 O 3 +Ta 2 O 5 +WO 3 with 0 to 10 La 2 O 3 , 0 to 6 Ta 2 O 5 and 0 to 10 WO 3 .
Claim 2
Dependent Claim
181 words
A glass composition for an ophthalmic lens having a refractive index of at least 1.69, an Abbe value of at least 39 and a specific gravity of not more than 3.2 and consisting essentially of, in percent by weight: 1. 42 to 52 SiO 2 +Al 2 O 3 +B 2 O 3 with 20 to 42 SiO 2 , 5 to 13 Al 2 O 3 and 0 to 20 B 2 O 3 ; 2. 22 to 39 CaO+MgO with 12 to 39 CaO and 0 to 20 MgO; 3. 15 to 28 ZrO 2 +TiO 2 +Nb 2 O 5 with 0 to 7 ZrO 2 , 5 to 13 TiO 2 and 0 to 15 Nb 2 O 5 ; 4. 0 to 15 BaO+SrO+ZnO with 0 to 6 BaO, 0 to 10 SrO and 0 to 15 ZnO; and 5. 0 to 10 La 2 O 3 +Ta 2 O 5 +WO 3 with 0 to 10 La 2 O 3 , 0 to 6 Ta 2 O 5 and 0 to 10 WO 3 .
Claim 3
Dependent Claim
179 words
A glass composition for an ophthalmic lens as described in claim 1 having a refractive index of at least 1.70, an Abbe value of at least 40 and a specific gravity of not more than 3.1 and consisting essentially of, in percent by weight: 1. 44 to 50 SiO 2 +AL 2 O 3 +B 2 O 3 with 25 to 42 SiO 2 , 5 to 11 Al 2 O 3 and 0 to 10 B 2 O 3 ; 2. 22 to 35 CaO+MgO with 15 to 35 CaO and 0 to 15 MgO; 3. 17 to 26 ZrO 2 +TiO 2 +Nb 2 O 5 with 2 to 7 ZrO 2 , 5 to 11 TiO 2 and 4 to 15 Nb 2 O 5 ; and 4. 0 to 8 BaO+SrO+ZnO+La 2 O 3 +Ta 2 O 5 +WO 3 with 0 to 5 BaO, 0 to 5 SrO, 0 to 8 ZnO, 0 to 5 La 2 O 3 , 0 to 5 Ta 2 O 5 and 0 to 5 WO 3 .
Claim 4
Dependent Claim
208 words
A glass composition for an ophthalmic lens having a refractive index of at least 1.69, an Abbe value of at least 39 and a specific gravity of not more than 3.2 and consisting essentially of, in percent by weight: 1. 40 to 52 SiO 2 +Al 2 O 3 +B 2 O 3 with 20 to 52 SiO 2 , 0 to 13 Al 2 O 3 and 0 to 20 B 2 O 3 ; 2. 10 to 35 CaO+MgO with 1 to 35 CaO and 0 to 20 MgO; 3. 1 to 20 Li 2 O+Na 2 O+K 2 O with 0 to 15 Li 2 O and 0 to 15 Na 2 O+K 2 O; 4. 14 to 30 ZrO 2 +TiO 2 +Nb 2 O 5 with 0 to 11 ZrO 2 , 4 to 14 TiO 2 and 0 to 20 Nb 2 O 5 ; 5. 0 to 15 BaO+SrO+ZnO with 0 to 8 BaO, 0 to 12 SrO and 0 to 15 ZnO; and 6. 0 to 15 La 2 O 3 +Ta 2 O 5 +WO 3 with 0 to 12 La 2 O 3 , 0 to 10 Ta 2 O 5 and 0 to 15 WO 3 .
Claim 5
Dependent Claim
208 words
A glass composition for an ophthalmic lens having a refractive index of at least 1.69, an Abbe value of at least 39 and a specific gravity of not more than 3.2 and consisting essentially of, in percent by weight: 1. 40 to 52 SiO 2 +Al 2 O 3 +B 2 O 3 with 20 to 52 SiO 2 , 0 to 13 Al 2 O 3 and 0 to 20 B 2 O 3 ; 2. 10 to 35 CaO+MgO with 1 to 35 CaO and 0 to 20 MgO; 3. 1 to 20 Li 2 O+Na 2 O+K 2 O with 0 to 15 Li 2 O and 0 to 15 Na 2 O+K 2 O; 4. 14 to 30 ZrO 2 +TiO 2 +Nb 2 O 5 with 0 to 11 ZrO 2 , 4 to 14 TiO 2 and 0 to 20 Nb 2 O 5 ; 5. 0 to 15 BaO+SrO+ZnO with 0 to 8 BaO, 0 to 12 SrO and 0 to 15 ZnO; and 6. 0 to 15 La 2 O 3 +Ta 2 O 5 +WO 3 with 0 to 12 La 2 O 3 , 0 to 10 Ta 2 O 5 and 0 to 15 WO 3 .
Claim 6
Dependent Claim
204 words
A glass composition for an ophthalmic lens as described in claim 3 having a refractive index of at least 1.70, an Abbe value of 40 and a specific gravity of not more than 3.0 and consisting essentially of, in percent by weight: 1. 42 to 50 SiO 2 +Al 2 O 3 +B 2 O 3 with 33 to 50 SiO 2 , 0 to 5 Al 2 O 3 and 0 to 15 B 2 O 3 ; 2. 15 to 30 CaO+MgO with 10 to 30 CaO and 0 to 10 MgO; 3. 2 to 15 Li 2 O+Na 2 O+K 2 O with 2 to 12 Li 2 O and 0 to 5 Na 2 O+K 2 O; 4. 17 to 30 ZrO 2 +TiO 2 +Nb 2 O 5 with 2 to 7 ZrO 2 , 4 to 11 TiO 2 and 4 to 20 Nb 2 O 5 ; and 5. 0 to 5 BaO+SrO+ZnO+La 2 O 3 +Ta 2 O 5 +WO 3 with 0 to 4 BaO, 0 to 4 SrO, 0 to 5 ZnO, 0 to 4 La 2 O 3 , 0 to 4 Ta 2 O 5 and 0 to 5 WO 3 .
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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |