US2763435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine grinding process for calcium minerals
Assignee: Individual
•
Filing: 1955-04-18
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Granted: 1956-09-18
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Expires: 1975-04-18
Abstract
No abstract record available.
Inventors
- 👤 Merrill E Jordan
- 👤 William G Burbine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
B; B02; B02C; B02C19/00; B02C17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR GRINDING CALCIUM MINERALS COMPRISING ADDING TO A COARSE CRUSHED MINERAL IN WHICH CALCIUM IS THE PREDOMINANT CATION A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF OXALIC ACID AND AMMONIUM OXALATE IN AN AMOUNT EQUIVALENT TO AT LEAST ABOUT 0.05 PART BY WEIGHT OF OXALIC ACID PER 100 PARTS OF SAID MINERAL AND SUBJECTING SAID MINERAL WHILE ADMIXED WITH SAID SUBSTANCE TO THE FINE GRINDING ACTION OF A MASS OF TUMBLING AND ROLLING HARD SURFACED BODIES WHICH ARE LARGE IN SIZE RELATIVE TO THE SIZE OF THE INDIVIDUAL PARTICLES OF COARSE CRUSHED MINERAL.
Claim 2
Dependent Claim
95 words
A PROCESS FOR GRINDING CALCIUM MINERALS COMPRISING ADDING TO A COARSE CRUSHED MINERAL IN WHICH CALCIUM IS THE PREDOMINANT CATION A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF OXALIC ACID AND AMMONIUM OXALATE IN AN AMOUNT EQUIVALENT TO AT LEAST ABOUT 0.05 PART BY WEIGHT OF OXALIC ACID PER 100 PARTS OF SAID MINERAL AND SUBJECTING SAID MINERAL WHILE ADMIXED WITH SAID SUBSTANCE TO THE FINE GRINDING ACTION OF A MASS OF TUMBLING AND ROLLING HARD SURFACED BODIES WHICH ARE LARGE IN SIZE RELATIVE TO THE SIZE OF THE INDIVIDUAL PARTICLES OF COARSE CRUSHED MINERAL.
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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |