US3666414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing transparent or opaque fused silica or glass with a high silicon content
Assignee: Heraeus Schott Quarzschmelze GmbH
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Filing: 1971-03-15
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Granted: 1972-05-30
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Expires: 1991-03-15
Abstract
Abstract TREATING THE SILICEOUS RAW PRODUCT FOR THE PRODUCTION OF TRANSPARENT OR OPAQUE FUSED SILICA OR OF GLASS WITH A HIGH SILICON CONTENT BY MEANS OF A SILICON HALIDE SO AS TO AVOID BUBBLES, SHRINK HOLES OR THE LIKE.
Inventors
- 👤 Otto Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:06
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/022; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 0
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |