Patent US3276860A successfully refreshed from Google Patents.
US3276860A
Expired / Lapsed
US
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Preparation of fluorspar
Assignee: Individual
•
Filing: 1964-02-03
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Granted: 1966-10-04
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Expires: 1984-02-03
Abstract
No abstract record available.
Inventors
- 👤 Lintz Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:40
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/20; C01F11/22; C21; C21C; C21C7/00; C21C7/04; C21C7/076; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PREPARING FLUORSPAR FINES FOR USE AS FLUXES COMPRISING: (A) CONCENTRATING SAID FINES TO A MINIMUM LEVEL OF ABOUT 20% CAF2; (B) MOISTENING SAID FINES WITH BETWEEN ABOUT 7 AND 18 WEIGHT PERCENT WATER; (C) ADDING TO THE SAID FINES BETWEEN ABOUT 1 AND 7 WEIGHT PERCENT OF A CHLORIDE SELECTED FROM THE CLASS CONSISTING OF SODIUM CHLORIDE, CALCIUM CHLORIDE AND MAGNESIUM CHLORIDE; (D) FORMING BRIQUETTS OF THE FOREGOING MIXTURE; (E) SINTERING THE BRIQUETTS SO FORMED TO A TEMPERATURE OF AT LEAST ABOUT 1200*C. FOR A TIME SUFFICIENT TO SINTER SAID FLUOSPAR AND TO DRIVE OFF A SUBSTANITAL FRACTION OF SAID CHLORIDE ADDED.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PREPARING FLUORSPAR FINES FOR USE AS FLUXES COMPRISING: (A) CONCENTRATING SAID FINES TO A MINIMUM LEVEL OF ABOUT 20% CAF2; (B) MOISTENING SAID FINES WITH BETWEEN ABOUT 7 AND 18 WEIGHT PERCENT WATER; (C) ADDING TO THE SAID FINES BETWEEN ABOUT 1 AND 7 WEIGHT PERCENT OF A CHLORIDE SELECTED FROM THE CLASS CONSISTING OF SODIUM CHLORIDE, CALCIUM CHLORIDE AND MAGNESIUM CHLORIDE; (D) FORMING BRIQUETTS OF THE FOREGOING MIXTURE; (E) SINTERING THE BRIQUETTS SO FORMED TO A TEMPERATURE OF AT LEAST ABOUT 1200*C. FOR A TIME SUFFICIENT TO SINTER SAID FLUOSPAR AND TO DRIVE OFF A SUBSTANITAL FRACTION OF SAID CHLORIDE ADDED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |