Patent US4642944A successfully refreshed from Google Patents.
US4642944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feeding abrasive material
Assignee: British Hydromechanics Research Group
•
Filing: 1985-08-06
•
Granted: 1987-02-17
•
Expires: 2005-08-06
Abstract
Abstract A system for supplying a slurry includes a hopper having a lower portion tapering to an outlet at its lower end. A liquid is supplied to the hopper interior along a wall of the lower portion in a direction having a horizontal component. Particulate material feeding from a main portion of the hopper into the lower portion becomes entrained in the liquid, thus forming the slurry.
Inventors
- 👤 Robert M. Fairhurst
- 👤 David H. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:49
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0007
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A system for supplying a slurry, comprising a hopper body for particulate material, said hopper body having a main portion in communication with a lower portion that tapers toward an outlet at a lower end of said lower portion, and means supplying liquid to the interior of said lower portion along a wall of said lower portion and in a direction having a horizontal component, whereby said slurry is formed in said lower portion.
Claim 2
Independent Claim
74 words
A system for supplying a slurry, comprising a hopper body for particulate material, said hopper body having a main portion in communication with a lower portion that tapers toward an outlet at a lower end of said lower portion, and means supplying liquid to the interior of said lower portion along a wall of said lower portion and in a direction having a horizontal component, whereby said slurry is formed in said lower portion.
Claim 3
Dependent Claim
22 words
A system as claimed in claim 1, further comprising means for supplying additional liquid to said main portion of said hopper body.
Claim 4
Dependent Claim
17 words
A system as claimed in claim 1, wherein said lower portion of said hopper body is frusto-conical.
Claim 5
Dependent Claim
19 words
A system as claimed in claim 1, wherein said direction of liquid supply also has a downward vertical component.
Claim 6
Dependent Claim
21 words
A system as claimed in claim 4, wherein said direction of liquid supply is inclined at least 30° downward from horizontal.
Claim 7
Dependent Claim
22 words
A system as claimed in claim 1, further comprising means for mixing slurry output from said hopper body with pressurized carrier liquid.
Claim 8
Dependent Claim
14 words
A system as claimed in claim 6, wherein said mixing means comprises an ejector.
Claim 9
Dependent Claim
16 words
A system as claimed in claim 6, wherein said pressurized carrier liquid is water under pressure.
Claim 10
Dependent Claim
22 words
A system as claimed in claim 6, wherein said pressurized carrier liquid is supplied at a pressure of at least 100 atmospheres.
Claim 11
Dependent Claim
34 words
A system as claimed in claim 6, including means for adjusting flow of the liquid supplied to said lower portion of said body relative to flow of the carrier liquid to said mixing means.
Claim 12
Dependent Claim
34 words
A system as claimed in claim 10, including means for supplying additional liquid to said main portion of said body and means for adjusting flow of that liquid relative to the previously mentioned flows.
Claim 13
Dependent Claim
25 words
A system as claimed in claim 6, including a jetting-type cutting nozzle and means conveying said slurry from said mixing means to said cutting nozzle.
References Cited (Backward Citations)
US24716A
Cited
USRE24716E
Cited
US895795A
Cited
DE1145549B
Cited
US3230016A
Cited
US4064293A
Cited
US4048757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |