US3762936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of borosilicate glass powder essentially free of alkali and alkaline earth metals
Assignee: EIDP Inc
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Filing: 1971-02-02
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Granted: 1973-10-02
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Expires: 1991-02-02
Abstract
Abstract An intimate mixture of a boric oxide source compound and colloidally subdivided amorphous silica is slowly heated to evolve all moisture and boric oxide source decomposition products. The mixture is then heated to a final temperature between 500* and 900* C. to form a borosilicate glass powder directly, or to form a borosilicate glass agglomerate which may readily be crushed to a powder.
Inventors
- 👤 R Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/026; C03C3/00; C03C3/04; C03C3/06; C03C3/076; C03C3/089; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/10; C03C2203/00; C03C2203/10; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The method of claim 1 wherein the source of boric oxide is ammonium borate.
Claim 2
Independent Claim
128 words
A method of manufacturing borosilicate glass powder essentially free of alkali and alkaline earth metals consisting essentially of: a. intimately contacting colloidally subdivided amorphous silica or a thermally decomposable source thereof and a source of boric oxide selected from the group consisting of boric oxide, ammonium borate and boric acid to form an intimate mixture thereof, said mixture containing a silica equivalent of 83 to 99.7 parts by weight, a boric oxide equivalent of 0.3 to 17 parts by weight on a dry basis, and contains less than 0.05 percent by weight alkali and alkaline earth metals; b. heating the mixture to a temperature from 500* to 900* C. to form readily crushable borosilicate glass agglomerates; and c. crushing said borosilicate glass agglomerates to form powdered borosilicate glass.
Claim 3
Dependent Claim
15 words
The method of claim 3 wherein the heating temperature is from 800 to 900* C.
Claim 4
Dependent Claim
14 words
The method of claim 3 wherein the source of boric oxide is ammonium borate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |