Patent US3329348A successfully refreshed from Google Patents.
US3329348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment grinding mill
Assignee: Individual
•
Filing: 1963-10-31
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Granted: 1967-07-04
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Expires: 1983-10-31
Abstract
No abstract record available.
Inventors
- 👤 John D Pootmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:29
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16; B01; B01F; B01F27/00; B01F27/80; B01F27/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD OF GRINDING AND OF DISPERSING BY MEANS OF AN ATTRITOR IN WHICH A MASS OF SUBSTANTIALLY SPHERICAL ATTRITIVE GRINDING ELEMENTS IS CONTAINED TO A SUBSTANTIAL DEPTH ALONG WITH A MATERIAL TO BE GROUND IN A VESSEL HAVING A CONFINING WALL, COMPRISING MOVING AN AGITATING BLADE IN A PERIPHERAL DIRECTION AND CLOSE TO SAID WALL THROUGHOUT THE DEPTH OF SAID GRINDING ELEMENTS THROUGH A MAJOR PART OF THE PERIPHERY OF THE MASS AT A DISTANCE FROM THE WALL LESS THAN THE RADIUS OF THE SMALLEST GRINDING ELEMENT AT A SPEED EFFECTIVE TO IMPART FLOW THROUGHOUT THE MASS WHILE LEAVING RADIALLY INWARD PORTIONS OF THE MASS FREE FROM CONTACT WITH SAID AGITATING BLADE.
Claim 2
Independent Claim
113 words
A METHOD OF GRINDING AND OF DISPERSING BY MEANS OF AN ATTRITOR IN WHICH A MASS OF SUBSTANTIALLY SPHERICAL ATTRITIVE GRINDING ELEMENTS IS CONTAINED TO A SUBSTANTIAL DEPTH ALONG WITH A MATERIAL TO BE GROUND IN A VESSEL HAVING A CONFINING WALL, COMPRISING MOVING AN AGITATING BLADE IN A PERIPHERAL DIRECTION AND CLOSE TO SAID WALL THROUGHOUT THE DEPTH OF SAID GRINDING ELEMENTS THROUGH A MAJOR PART OF THE PERIPHERY OF THE MASS AT A DISTANCE FROM THE WALL LESS THAN THE RADIUS OF THE SMALLEST GRINDING ELEMENT AT A SPEED EFFECTIVE TO IMPART FLOW THROUGHOUT THE MASS WHILE LEAVING RADIALLY INWARD PORTIONS OF THE MASS FREE FROM CONTACT WITH SAID AGITATING BLADE.
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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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |