US4350532A
Expired / Lapsed
US
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Glass composition and articles
Assignee: 3M Co
•
Filing: 1981-07-30
•
Granted: 1982-09-21
•
Expires: 2001-07-30
Abstract
Abstract This invention provides a novel glass composition having numerous uses. More particularly, the invention provides a single phase, radiopaque glass composition.
Inventors
- 👤 Ronald M. Randklev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:28
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C3/115; C03C3/118; A; A61; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/70; A61K6/71; A61K6/77; A61K6/78; C03C4/00; C03C4/08; C03C4/087; D; D06; D06M; D06M13/00; D06M13/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A single phase glass composition consisting essentially of, in percent by weight: ______________________________________
Zinc oxide 20 to 35%
Silica 45 to 65%
Boric oxide 3 to 15%
Aluminum oxide 0 to 10%
Aluminum fluoride At least 2%
Alkali metal oxide or 0 to 5%
alkaline earth metal oxide
______________________________________ wherein the combined weight of aluminum oxide and aluminum fluoride is in the range of at least about 5%, and wherein said composition exhibits an X-ray absorption characteristic of at least 1/16 inch.
Claim 2
Dependent Claim
82 words
A single phase glass composition consisting essentially of, in percent by weight: ______________________________________
Zinc oxide 20 to 35%
Silica 45 to 65%
Boric oxide 3 to 15%
Aluminum oxide 0 to 10%
Aluminum fluoride At least 2%
Alkali metal oxide or 0 to 5%
alkaline earth metal oxide
______________________________________ wherein the combined weight of aluminum oxide and aluminum fluoride is in the range of at least about 5%, and wherein said composition exhibits an X-ray absorption characteristic of at least 1/16 inch.
Claim 3
Dependent Claim
59 words
A composition in accordance with claim 1, wherein said glass consists essentially of, in percent by weight: ______________________________________
Zinc oxide 25 to 28%
Silica 46 to 48%
Boric oxide 6 to 9%
Aluminum oxide 1 to 3%
Aluminum fluoride 17 to 19%
______________________________________ wherein the combined weight of aluminum oxide and aluminum fluoride is not greater than about 20%.
Claim 4
Dependent Claim
20 words
A composition in accordance with claim 1, wherein said composition exhibits an X-ray absorption characteristic of at least 3/32 inch.
Claim 5
Dependent Claim
9 words
A prosthesis comprising a glass composition of claim 1.
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |