Patent US3741485A successfully refreshed from Google Patents.
US3741485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid energy grinder for increasing bulk density of materials
Assignee: Unifrax I LLC
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Filing: 1971-06-03
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Granted: 1973-06-26
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Expires: 1991-06-03
Abstract
Abstract A grinder for increasing the bulk density of finely divided materials, using an energetic stream of driving fluid to act upon the particulate materials within a suitable grinding chamber. Particle sizes are reduced sufficiently by impact grinding to give a product of increased bulk density. The grinder is especially effective for the size reduction of hard abrasive materials.
Inventors
- 👤 W Gage
- 👤 L Karski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:29
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/06; B02C19/061
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A fluid energy grinder for particulate size reduction by impact grinding, comprising in combination: a. a substantially cylindrical grinding chamber of wear resistant material; b. a top closure plate on the chamber, the plate having a first aperture centrally located therein; c. a fluid exit tube positioned within the first aperture for the exit of fluid; d. a bottom closure plate on the chamber, said bottom closure plate having a second aperture therein; e. a product exit tube positioned within the second aperture for the exit of product; and f. fluid driving means, comprising a feed chamber and a fluid driving nozzle associated with the feed chamber for driving a mixture of fluid and particulate feed tangentially into the grinding chamber; the fluid exit tube being of substantially less diameter than that of the product exit tube and being positioned to permit adjustable insertion into said product exit tube for a relatively short distance.
Claim 2
Dependent Claim
154 words
A fluid energy grinder for particulate size reduction by impact grinding, comprising in combination: a. a substantially cylindrical grinding chamber of wear resistant material; b. a top closure plate on the chamber, the plate having a first aperture centrally located therein; c. a fluid exit tube positioned within the first aperture for the exit of fluid; d. a bottom closure plate on the chamber, said bottom closure plate having a second aperture therein; e. a product exit tube positioned within the second aperture for the exit of product; and f. fluid driving means, comprising a feed chamber and a fluid driving nozzle associated with the feed chamber for driving a mixture of fluid and particulate feed tangentially into the grinding chamber; the fluid exit tube being of substantially less diameter than that of the product exit tube and being positioned to permit adjustable insertion into said product exit tube for a relatively short distance.
Claim 3
Dependent Claim
23 words
A fluid energy grinder according to claim 1 in which the said product exit tube has an adjustable sleeve in slidable relationship thereon.
Claim 4
Dependent Claim
42 words
A fluid energy grinder according to claim 1 in which the feed chamber and fluid driving nozzle are attached to the grinding chamber at a sufficient distance from the bottom closure plate to establish a layer of moving material on said plate.
Claim 5
Dependent Claim
34 words
A fluid energy grinder according to claim 1 in which the feed chamber has a linear conduit attached thereto, said conduit being disposed in a downward position to receive feed material by suction flow.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |