US3620575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate-conveying apparatus
Assignee: Keystone Valve Corp
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Filing: 1969-09-05
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Granted: 1971-11-16
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Expires: 1989-09-05
Abstract
Abstract A system for (1) removal of particulate material from a supply area or container and filling a storage vessel, and (2) for discharging such material from the storage vessel into a supply line. Changing from cycle No. 1 to cycle No. 2 is effected by virtue of a reversible motor.
Inventors
- 👤 Donald J Mciver
- 👤 Russell D Mcclaid Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:02
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/04; B65G53/06; B65G53/10; B65G53/12; B65G53/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A particulate conveying system comprising a container for solid particulate material, filter means separating an upper portion of said container from a lower portion, a first fluid conduit in communication with the upper portion of said container, a second fluid conduit, a particulate material inlet and a particulate material outlet in communication with the lower portion of said container, said first fluid conduit including valve means allowing fluid flow outwardly from the container but inhibiting fluid flow inwardly thereto, said second fluid conduit including valve means allowing fluid flow inwardly to said container but preventing fluid flow outwardly therefrom, a reversible blower, and means connecting both said first and second fluid conduits to the same opening of said blower, whereby upon operation of said blower in one direction a vacuum is imposed in both of said first and second conduits, and upon operation of said blower in the other direction a pressure is imposed in both of said first and second conduits said valve means in the first fluid conduit has means to allow a small fluid flow into the container when said blower is operated in said other direction to provide air for cleaning said filter.
Claim 2
Dependent Claim
197 words
A particulate conveying system comprising a container for solid particulate material, filter means separating an upper portion of said container from a lower portion, a first fluid conduit in communication with the upper portion of said container, a second fluid conduit, a particulate material inlet and a particulate material outlet in communication with the lower portion of said container, said first fluid conduit including valve means allowing fluid flow outwardly from the container but inhibiting fluid flow inwardly thereto, said second fluid conduit including valve means allowing fluid flow inwardly to said container but preventing fluid flow outwardly therefrom, a reversible blower, and means connecting both said first and second fluid conduits to the same opening of said blower, whereby upon operation of said blower in one direction a vacuum is imposed in both of said first and second conduits, and upon operation of said blower in the other direction a pressure is imposed in both of said first and second conduits said valve means in the first fluid conduit has means to allow a small fluid flow into the container when said blower is operated in said other direction to provide air for cleaning said filter.
Claim 3
Dependent Claim
56 words
A particulate conveying system as defined by claim 1 and including control means connected to said blower to change its direction from vacuum to pressure upon filling of said container with particulate material to a predetermined level, and to change its direction from pressure to vacuum upon the substantial emptying of said container of particulate material.
Claim 4
Dependent Claim
58 words
A particulate conveying system as defined by claim 2 wherein said control means includes a pressure switch which operates to switch the blower from pressure to vacuum in response to a drop in pressure in said container, and means for inactivating said pressure switch for a limited period of time immediately following the switch from vacuum to pressure.
Claim 5
Dependent Claim
30 words
A particulate conveying system as defined by claim 1 and including bypass means communicating between said second fluid conduit and said material outlet, and means for rendering the bypass inoperative.
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |