Patent US4732882A successfully refreshed from Google Patents.
Patent US3071459A successfully refreshed from Google Patents.
US3071459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hafnium metal
Assignee: Individual
•
Filing: 1960-10-17
•
Granted: 1963-01-01
•
Expires: 1980-10-17
Abstract
No abstract record available.
Inventors
- 👤 Gerald W Elger
- 👤 Richard W Boubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:09
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/14; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS OF PRODUCING HAFNIUM METAL OF A HIGH DEGREE OF PURITY AND DUCTILITY, SAID PROCESS CONSISTING IN REACTING HAFNIUM CHLORIDE CONTAINING HAFNIUM OXYCHLORIDE AND HAFNIUM OXIDE AS IMPURITIES IN GASEOUS FORM WITH CHLORINE GAS IN THE PRESENCE OF CARBON AT ELEVATED TEMPERATURE WHEREBY OXYCHLORIDE AND OXIDE ARE CONVERTED TO HAFNIUM CHLORIDE VAPOR; REACTING SAID HAFNIUM CHLORIDE VAPOR WITH AN EXCESS OF MOLTEN MAGNESIUM METAL WHEREBY THE HAFNIUM CHLORIDE IS REDUCED TO THE METAL AND THE HAFNIUM METAL IS CONDENSED ON THE MAGNESIUM METAL; AND COOLING THE HAFNIUM METAL FORMED FOR SOLIDIFICATION.
Claim 2
Dependent Claim
92 words
A PROCESS OF PRODUCING HAFNIUM METAL OF A HIGH DEGREE OF PURITY AND DUCTILITY, SAID PROCESS CONSISTING IN REACTING HAFNIUM CHLORIDE CONTAINING HAFNIUM OXYCHLORIDE AND HAFNIUM OXIDE AS IMPURITIES IN GASEOUS FORM WITH CHLORINE GAS IN THE PRESENCE OF CARBON AT ELEVATED TEMPERATURE WHEREBY OXYCHLORIDE AND OXIDE ARE CONVERTED TO HAFNIUM CHLORIDE VAPOR; REACTING SAID HAFNIUM CHLORIDE VAPOR WITH AN EXCESS OF MOLTEN MAGNESIUM METAL WHEREBY THE HAFNIUM CHLORIDE IS REDUCED TO THE METAL AND THE HAFNIUM METAL IS CONDENSED ON THE MAGNESIUM METAL; AND COOLING THE HAFNIUM METAL FORMED FOR SOLIDIFICATION.
References Cited (Backward Citations)
US2267041A
Cited
US2586134A
Cited
US2758831A
Cited
US2890112A
Cited
GB786760A
Cited
US2870073A
Cited
US2915384A
Cited
US2938783A
Cited
US2969852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |