US5036842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator with blower support and regeneration of the breathing filter
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1989-12-26
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Granted: 1991-08-06
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Expires: 2009-12-26
Abstract
Abstract A respirator with blower support for the flow through at least two filters in the breathing gas lead is provided such that the flow of one of the filters temporarily is in the inhalation direction and the other flow is in the exhalation direction respectively and their flow through direction is periodically reversible. This allows flow through of the filter in small volumes without a premature bursting or filter depletion. The wearer comfort should remain and the blower support is not diminished in its operation.
Inventors
- 👤 Carl E. van der Smissen
- 👤 Wolfgang Eckstein
- 👤 Hans-Joachim Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:59
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/006; A61; A61M; A61M16/00; A61M16/0003; A61M16/0009; A61M16/0057; A61M16/0066; A61M16/06; A61M16/10; A61M16/105; A61M16/106; A61M16/1065; A61M16/107
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A respirator with blower support, comprising: a breathing gas lead line; a first line connected to said breathing gas lead line; a second line connected to said breathing gas lead line; blower means connected to each of said first and second lines for blowing air in an inhalation direction in said first line and in an exhalation direction in said second line and said blower means periodically reversing the air flow direction to provide flow in an exhalation direction in said first line and to provide flow in an inhalation direction in said second line, said first and second lines being each connected to a filter.
Claim 2
Dependent Claim
106 words
A respirator with blower support, comprising: a breathing gas lead line; a first line connected to said breathing gas lead line; a second line connected to said breathing gas lead line; blower means connected to each of said first and second lines for blowing air in an inhalation direction in said first line and in an exhalation direction in said second line and said blower means periodically reversing the air flow direction to provide flow in an exhalation direction in said first line and to provide flow in an inhalation direction in said second line, said first and second lines being each connected to a filter.
Claim 3
Dependent Claim
28 words
A respirator according to claim 1, wherein said blower means includes an individual blower connected to said first line and an individual blower connected to said second line.
Claim 4
Dependent Claim
39 words
A respirator according to claim 1, whereins aid blower means includes a common blower connected to said lead line and a switching valve for switching the connection of said first line and said second line to said common blower.
Claim 5
Dependent Claim
26 words
A respirator according to claim 1, wherein drying cartridges are connected to each of said first and second line between said filter and said lead line.
Claim 6
Dependent Claim
94 words
A respirator with blower support arrangement, comprising a main breathing gas line connected to a user; a first line connected to said breathing gas line; a second line connected to said breathing gas line; a first filter connected to said first line; a second filter connected to said second line; and, blower means for generating an inhalation flow in said first line and an exhalation flow in said second line and means for periodically reversing said flow to provide an exhalation flow in said first line and an inhalation flow in said second line.
Claim 7
Dependent Claim
94 words
A respirator with blower support arrangement, comprising a main breathing gas line connected to a user; a first line connected to said breathing gas line; a second line connected to said breathing gas line; a first filter connected to said first line; a second filter connected to said second line; and, blower means for generating an inhalation flow in said first line and an exhalation flow in said second line and means for periodically reversing said flow to provide an exhalation flow in said first line and an inhalation flow in said second line.
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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) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |