Patent US4283227A successfully refreshed from Google Patents.
US4283227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ZnO--SeO2 --R2 O soluble glass
Assignee: STC PLC
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Filing: 1979-09-14
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Granted: 1981-08-11
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Expires: 1999-09-14
Abstract
Abstract A subcutaneous implant for supplying one or more trace elements to an animal. The implant is made from a zinc oxide based glass which is prepared in rod form, a short section of the rod being implanted under the skin of an animal. Typically the glass may contain selenium dioxide for supplying small quantities of selenium to the animal.
Inventors
- 👤 Cyril F. Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0019; A61K9/0024; A01; A01K; A01K13/00; A01K29/00; A61D; A61D7/00; A61K9/20; A61K9/2004; A61K9/2009; A61M; A61M31/00; A61M31/002; C; C03; C03C; C03C3/00; C03C3/12; C03C4/00; C03C4/0035
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A water soluble glass composition adapted to release trace amounts of selenium into an aqueous solution, the composition including a fused mixture of 40 to 60 mol % selenium dioxide (SeO 2 ) as a glass-forming oxide and 35 to 60 mol % zinc oxide (ZnO) as a glass-modifying oxide as its major constituents and at least one alkali metal oxide as a minor constituent for modifying the selenium release rate, wherein the alkali metal oxide molar concentration is at least as low as 13.1%.
Claim 2
Dependent Claim
85 words
A water soluble glass composition adapted to release trace amounts of selenium into an aqueous solution, the composition including a fused mixture of 40 to 60 mol % selenium dioxide (SeO 2 ) as a glass-forming oxide and 35 to 60 mol % zinc oxide (ZnO) as a glass-modifying oxide as its major constituents and at least one alkali metal oxide as a minor constituent for modifying the selenium release rate, wherein the alkali metal oxide molar concentration is at least as low as 13.1%.
Claim 3
Dependent Claim
95 words
A water soluble glass composition adapted to release trace amounts of selenium into an aqueous solution, the composition including a fused mixture of selenium dioxide (SeO 2 ) as a glass-forming oxide and zinc oxide (ZnO) as a glass-modifying oxide as its major constituents and at least one alkali metal oxide as a minor constituent for modifying the selenium release rate, wherein the molar composition of said glass composition is substantially xM 2 O:(50-x)ZnO:50SeO 2 , M 2 O is the alkali metal oxide content and the value of x is between 5 and 18.
Claim 4
Dependent Claim
95 words
A water soluble glass composition adapted to release trace amounts of selenium into an aqueous solution, the composition including a fused mixture of selenium dioxide (SeO 2 ) as a glass-forming oxide and zinc oxide (ZnO) as a glass-modifying oxide as its major constituents and at least one alkali metal oxide as a minor constituent for modifying the selenium release rate, wherein the molar composition of said glass composition is substantially xM 2 O:(50-x)ZnO:50SeO 2 , M 2 O is the alkali metal oxide content and the value of x is between 5 and 18.
Claim 5
Dependent Claim
42 words
A water soluble glass composition as recited in claim 2, comprising 5 to 8 mol % Na 2 O, 5 to 8 mol % K 2 O, 35 to 38 mol % ZnO, and 49 to 51 mol % SeO 2 .
Claim 6
Dependent Claim
34 words
A water soluble glass composition as recited in claim 3, comprising 6.59 mol % Na 2 O, 6.61 mol % K 2 O, 36.61 mol % ZnO, and 50.19 mol % SeO 2 .
Claim 7
Dependent Claim
34 words
A water soluble glass composition as recited in claim 2 comprising 49 to 51 mol % SeO 2 , 37 to 40 mol % ZnO and 9 to 12 mol % K 2 O.
Claim 8
Dependent Claim
28 words
A water soluble glass composition as recited in claim 5, comprising 50.6 mol % SeO 2 , 38.6 mol % ZnO, and 10.8 mol % K 2 O.
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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |