US2839367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of crystalline boron
Assignee: American Potash and Chemical Corp
•
Filing: 1957-04-09
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Granted: 1958-06-17
•
Expires: 1977-04-09
Abstract
No abstract record available.
Inventors
- 👤 David R Stern
- 👤 Lynds Lahmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:20
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/02; C01B35/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR PRODUCING ELEMENTAL BORON COMPRISING PASSING A BORON HALIDE AND HYDROGEN OVER A HEATED FILAMENT ELEMENT TO DECOMPOSE THE BORON HALIDE AND DEPOSIT ELEMENTAL BORON OF THE FILAMENT, THE FILAMENT ELEMENT BEING ONE SELECTED FROM THE GROUP CONSISTING OF TITANUM AND ZIRCONIUM AND BEING AT A TEMPERATURE OF ABOUT 1000*C.
Claim 2
Dependent Claim
52 words
A PROCESS FOR PRODUCING ELEMENTAL BORON COMPRISING PASSING A BORON HALIDE AND HYDROGEN OVER A HEATED FILAMENT ELEMENT TO DECOMPOSE THE BORON HALIDE AND DEPOSIT ELEMENTAL BORON OF THE FILAMENT, THE FILAMENT ELEMENT BEING ONE SELECTED FROM THE GROUP CONSISTING OF TITANUM AND ZIRCONIUM AND BEING AT A TEMPERATURE OF ABOUT 1000*C.
References Cited (Backward Citations)
US1774410A
Cited
US2253471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |