US5711215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the compression of powdered substances
Assignee: Evonik Operations GmbH
•
Filing: 1996-09-16
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Granted: 1998-01-27
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Expires: 2016-09-16
Abstract
Abstract Powdered substances are compressed by a process wherein the powdered substances are enclosed in a flexible receptacle, the receptacle is enclosed in a pressure vessel and the space between the wall of the receptacle and the wall of the pressure vessel is pressurized with compressed gas.
Inventors
- 👤 Gerhard Sextl
- 👤 Sabine Bartelt
- 👤 Klaus Wilmes
- 👤 Roland Reuter
- 👤 Rudolf Schwarz
- 👤 Friedel Worch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/001
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A device for the compression of powdered substances to a given bulk density range while preserving the powdered structure of the powder, said apparatus consisting essentially of a pressure vessel having openings at opposite ends, means for hermetically sealing said openings, a single flexible receptacle made of a material impermeable to gases and likewise open above and below and positioned within said vessel so that said openings coincide with the openings of said pressure vessel, said receptacle and said pressure vessel define a space which is capable of being pressurized, means for pressuring the space between said receptacle and said vessel without exchange of gas between the interior of the receptacle and the interior of the vessel causing the single flexible receptacle to quasi-isostatically compress a powdered substance, a source of powdered substance to be quasi-isostatically compressed, means for introducing said powdered substance into said receptacle and means for releasing the pressure to obtain a compressed powdered substance while the single flexible receptacle swells up to its original volume.
Claim 2
Independent Claim
169 words
A device for the compression of powdered substances to a given bulk density range while preserving the powdered structure of the powder, said apparatus consisting essentially of a pressure vessel having openings at opposite ends, means for hermetically sealing said openings, a single flexible receptacle made of a material impermeable to gases and likewise open above and below and positioned within said vessel so that said openings coincide with the openings of said pressure vessel, said receptacle and said pressure vessel define a space which is capable of being pressurized, means for pressuring the space between said receptacle and said vessel without exchange of gas between the interior of the receptacle and the interior of the vessel causing the single flexible receptacle to quasi-isostatically compress a powdered substance, a source of powdered substance to be quasi-isostatically compressed, means for introducing said powdered substance into said receptacle and means for releasing the pressure to obtain a compressed powdered substance while the single flexible receptacle swells up to its original volume.
Claim 3
Dependent Claim
24 words
An apparatus as set forth in claim 1 in which said vessel is vertically arranged, with said openings at the bottom and the top.
Claim 4
Dependent Claim
16 words
An apparatus as set forth in claim 1 in which the vessel has a circular cross-section.
Claim 5
Dependent Claim
14 words
An apparatus as set forth in claim 1 in which said receptacle is tubular.
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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) | 2001-01-26 | 2001-07-28 | 2002-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-26 | 2005-07-28 | 2006-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-26 | 2009-07-28 | 2010-01-27 | $7700.00 | Window Closed / Lapsed |