US3103428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting pure silicon shapes
Assignee: —
•
Filing: —
•
Granted: 1963-09-10
•
Expires: 1980-09-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
G; G02; G02B; G02B1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE METHOD OF FORMING A DOME-SHAPED SILICON BODY COMPRISING PROVIDING A HEMISPHERICAL QUARTZ MOLD MEMBER WITH A SILICON NITRIDE LINING, INTRODUCING A CHARGE OF SOLID SILICON INTO THE QUARTZ MOLD MEMBER, MELTING THE SILICON IN THE QUARTZ MOLD MEMBER, PROVIDING A HEMISPHERICAL GRPHITE MOLD MEMBER WITH A SILICON NITRIDE COATING, FORMING THE CONCAVE AND CONVEX SURFACES IOF THE QUARTZ AND GRAPHITE MOLD MEMBERS IN GENERALLY CONCENTRIC RELATIONSHIP WITH RESPECT TO EACH OTHER, AND CASTING THE SILICON INTO THE SHAPE OF A DOME BETWEEN THE CONCENTRIC MOLD SURFACES BY GRADUALLY COOLING AND SILIDIFYING THE MOLTEN SILICON FROM THE BOTTOM TO THE TOP THEREOF.
Claim 2
Independent Claim
102 words
THE METHOD OF FORMING A DOME-SHAPED SILICON BODY COMPRISING PROVIDING A HEMISPHERICAL QUARTZ MOLD MEMBER WITH A SILICON NITRIDE LINING, INTRODUCING A CHARGE OF SOLID SILICON INTO THE QUARTZ MOLD MEMBER, MELTING THE SILICON IN THE QUARTZ MOLD MEMBER, PROVIDING A HEMISPHERICAL GRPHITE MOLD MEMBER WITH A SILICON NITRIDE COATING, FORMING THE CONCAVE AND CONVEX SURFACES IOF THE QUARTZ AND GRAPHITE MOLD MEMBERS IN GENERALLY CONCENTRIC RELATIONSHIP WITH RESPECT TO EACH OTHER, AND CASTING THE SILICON INTO THE SHAPE OF A DOME BETWEEN THE CONCENTRIC MOLD SURFACES BY GRADUALLY COOLING AND SILIDIFYING THE MOLTEN SILICON FROM THE BOTTOM TO THE TOP THEREOF.
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) | 1966-09-09 | 1967-03-11 | 1967-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-09 | 1971-03-11 | 1971-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-09 | 1975-03-11 | 1975-09-10 | $7700.00 | Window Closed / Lapsed |