US2829962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing tungsten sponge or powder of high purity
Assignee: Individual
•
Filing: 1955-03-22
•
Granted: 1958-04-08
•
Expires: 1975-03-22
Abstract
No abstract record available.
Inventors
- 👤 Lester D Supiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:06
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE METHOD OF PRODUCING TUNGSTEN OF HIGH PURITY COMPRISING REACTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH TUNGSTATES, ALKALI METAL TUNGSTATES, MIXTURES THEREOF, WITH BORIC ACID IN THE PRESENCE OF A REDUCING AGENT AT APPROXIMATELY 1200*C.
Claim 2
Independent Claim
38 words
THE METHOD OF PRODUCING TUNGSTEN OF HIGH PURITY COMPRISING REACTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH TUNGSTATES, ALKALI METAL TUNGSTATES, MIXTURES THEREOF, WITH BORIC ACID IN THE PRESENCE OF A REDUCING AGENT AT APPROXIMATELY 1200*C.
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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |