Patent US2675993A successfully refreshed from Google Patents.
US2675993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for thermally working minerals and mineral-like materials
Assignee: Union Carbide Corp
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Filing: 1948-03-25
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Granted: 1954-04-20
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Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 George H Smith
- 👤 William J Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:16
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD OF THERMALLY WORKING A MASS OF ROCK WHICH COMPRISES SEPARATING MATERIAL FROM SAID MASS BY APPLYING AGAINST SAID MASS A FLAME HAVING A JET LINEAR VELOCITY GREATER THAN 2500 FEET PER SECOND, REMOVING THE SEPARATED MATERIAL, AND ADVANCING SAID FLAME ALONG A SELECTED
Claim 2
Independent Claim
45 words
A METHOD OF THERMALLY WORKING A MASS OF ROCK WHICH COMPRISES SEPARATING MATERIAL FROM SAID MASS BY APPLYING AGAINST SAID MASS A FLAME HAVING A JET LINEAR VELOCITY GREATER THAN 2500 FEET PER SECOND, REMOVING THE SEPARATED MATERIAL, AND ADVANCING SAID FLAME ALONG A SELECTED
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |