Patent US4981655A successfully refreshed from Google Patents.
US4981655A
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Chemical oxygen generator
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1988-07-08
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Granted: 1991-01-01
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Expires: 2008-07-08
Abstract
Abstract A chemical oxygen generator has a chemical mixture based on an alkali-metal chlorate (NaClO 3 ) which constitutes the charge of a cartridge having an ignition device and an oxygen outlet. This oxygen generator is improved so that the charge is insensitive to shock and so that it can be configured in any desired outer form and size and that an advancing reaction zone is assured without a further assisting device. The charge includes a tight bed of chemical pellets which lie one against the other to form the smallest possible contact surfaces.
Inventors
- 👤 Ernst G. Kolbe
- 👤 Rainer Ernst
- 👤 Hans-Burkhardt Fiedler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:19
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0296; A; A62; A62B; A62B21/00; C01B13/0203; C01B13/0218
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A chemical oxygen generator comprising: a cartridge housing having first and second ends; a charge of chemical pellets disposed in said housing between said ends, said pellets being made of a chemical mixture including an alkali-metal chlorate; an ignition device mounted at said first end for initiating a chemical reaction in said charge to release the oxygen; oxygen outlet means formed at said second end for passing the oxygen generated in said chemical reaction from said housing; and, biasing means for imparting a biasing force to said pellets so as to cause each two mutually adjacent ones of said pellets to make contact with each other at the smallest possible contact interface to facilitate the transmission of the ignition from one pellet to the next.
Claim 2
Dependent Claim
125 words
A chemical oxygen generator comprising: a cartridge housing having first and second ends; a charge of chemical pellets disposed in said housing between said ends, said pellets being made of a chemical mixture including an alkali-metal chlorate; an ignition device mounted at said first end for initiating a chemical reaction in said charge to release the oxygen; oxygen outlet means formed at said second end for passing the oxygen generated in said chemical reaction from said housing; and, biasing means for imparting a biasing force to said pellets so as to cause each two mutually adjacent ones of said pellets to make contact with each other at the smallest possible contact interface to facilitate the transmission of the ignition from one pellet to the next.
Claim 3
Dependent Claim
17 words
The chemical oxygen generator of claim 1, wherein said alkali-metal chlorate is sodium chlorate (NaClO 3 ).
Claim 4
Dependent Claim
33 words
The chemical oxygen generator of claim 1, said biasing means being a spring for applying said biasing force to said charge to increase the contact pressure at said contact interfaces between said pellets.
Claim 5
Dependent Claim
51 words
The chemical oxygen generator of claim 1, said charge being subdivided into a plurality of zones connected in series one next to the other; each of said zones containing a plurality of pellets having a reaction velocity different from the reaction velocity of the pellets contained in the next adjacent zone.
Claim 6
Dependent Claim
26 words
The chemical oxygen generator of claim 4, wherein the reaction velocity of the pellets in each of said zones is determined by different admixtures of additives.
Claim 7
Dependent Claim
50 words
The chemical oxygen generator of claim 1, said pellets having different particle sizes such that the pellets having a larger particle size conjointly define a plurality of interspaces therebetween; and, the pellets having a smaller particle size settling through and into said interspaces thereby increasing the density of said charge.
Claim 8
Dependent Claim
52 words
The chemical oxygen generator of claim 6, said pellets having the smaller particle size containing constituents in a mixture proportion to provide a first reaction velocity and said pellets having the larger particle size containing constituents in a mixture proportion to provide a second reaction velocity slower than said first reaction velocity.
Claim 9
Dependent Claim
29 words
The chemical oxygen generator of claim 1, each of said pellets being a multilayered pellet with each two mutually adjacent ones of the layers having respectively different reaction velocities.
Claim 10
Dependent Claim
18 words
The chemical oxygen generator of claim 8, one of said layers encasing the other one of said layers.
References Cited (Backward Citations)
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US3767367A
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US3902934A
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US3861880A
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US3868225A
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Cited
US4590041A
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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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |