US3218182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of submicroscopic high surface area inorganic products from oxide minerals
Assignee: Minerals and Chemicals Philipp Corp
•
Filing: 1963-01-14
•
Granted: 1965-11-16
•
Expires: 1983-01-14
Abstract
No abstract record available.
Inventors
- 👤 Glen A Hemstock
- 👤 Robert J Bergmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:06
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD FOR PRODUCING HIGH SURFACE AREA SUBMICRON SIZE FILLER MATERIAL FROM NATURALLY OCCURRING MINERALS WHICH COMPRISES: SUBJECTING A DRY MASS OF CRYSTALLINE HYDRATED OXIDE MINERAL TO DRY GRINDING UNTIL THE CRYSTAL STRUCTURE OF A SUBSTANTIAL PORTION OF SAID MASS OF MINERAL IS DESTROYED, SAID MINERAL BEING SELECTED FROM THE GROUP CONSISTING OF KAOLINITE, ANAUXITE, DICKITE, NACRITE, HALLOYSITE, GIBBSITE, BRUCITE, CHRYSOTILE, AND MIXTURES THEREOF, AND SUBJECTING THE MASS OF MINERAL THUS GROUND TO THE ACTION OF SATURATED STEAM AT SUPERATMOSPHERIC PRESSURE BELOW CRITICAL PRESSURE FOR A TIME SUFFICIENT TO PRODUCE A MATERIAL HAVING A SURFACE AREA OF AT LEAST 100 M.2/G.
Claim 2
Independent Claim
101 words
A METHOD FOR PRODUCING HIGH SURFACE AREA SUBMICRON SIZE FILLER MATERIAL FROM NATURALLY OCCURRING MINERALS WHICH COMPRISES: SUBJECTING A DRY MASS OF CRYSTALLINE HYDRATED OXIDE MINERAL TO DRY GRINDING UNTIL THE CRYSTAL STRUCTURE OF A SUBSTANTIAL PORTION OF SAID MASS OF MINERAL IS DESTROYED, SAID MINERAL BEING SELECTED FROM THE GROUP CONSISTING OF KAOLINITE, ANAUXITE, DICKITE, NACRITE, HALLOYSITE, GIBBSITE, BRUCITE, CHRYSOTILE, AND MIXTURES THEREOF, AND SUBJECTING THE MASS OF MINERAL THUS GROUND TO THE ACTION OF SATURATED STEAM AT SUPERATMOSPHERIC PRESSURE BELOW CRITICAL PRESSURE FOR A TIME SUFFICIENT TO PRODUCE A MATERIAL HAVING A SURFACE AREA OF AT LEAST 100 M.2/G.
References Cited (Backward Citations)
US1275705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |