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An inflator device for inflating an inflatable cushion of an inflatable cushion restraint system. The inflator device includes a reaction housing defining a reaction chamber containing a supply of gas generant material. An initiator device is connected to the reaction housing and is in reaction init

An inflator device for inflating an inflatable cushion of an inflatable cushion restraint system. The inflator device includes a reaction housing defining a reaction chamber containing a supply of gas generant material. An initiator device is connected to the reaction housing and is in reaction initiating communication with the supply of gas generant material. A filter housing is disposed around at least a portion of the reaction housing and at least in part defines a filter chamber. The filter housing includes an annular discharge opening. The produced inflation gas discharges from the filter housing to the inflatable cushion through the annular discharge opening. A filter is disposed in the filter chamber and external of the reaction housing.

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What is claimed is: 1. In an inflator device for inflating an inflatable cushion of an inflatable cushion restraint system, the inflator device including a supply of gas generant material to produce inflation gas upon reaction initiation, the improvement comprising: a reaction housing including a r

What is claimed is: 1. In an inflator device for inflating an inflatable cushion of an inflatable cushion restraint system, the inflator device including a supply of gas generant material to produce inflation gas upon reaction initiation, the improvement comprising: a reaction housing including a reaction housing side wall, the reaction housing at least in part defining a reaction chamber containing the supply of gas generant material; an initiator device connected to the reaction housing, the initiator device in reaction initiating communication with the supply of gas generant material; the reaction housing side wall including a plurality of reaction housing discharge openings, wherein upon reaction initiation of the supply of gas generant material, the inflation gas discharges from the reaction chamber through the reaction housing discharge openings; a strainer element disposed within the reaction housing and between the supply of gas generant material and the plurality of reaction housing discharge openings, the strainer element comprising a strainer side wall aligned with the reaction housing side wall and including a plurality of strainer discharge openings; a filter housing disposed around at least a portion of the reaction housing, the filter housing at least in part defining a filter chamber, the filter housing including an annular discharge opening, wherein the inflation gas discharges from the filter housing to the inflatable cushion through the annular discharge opening; and a filter disposed in the filter chamber and external of the reaction housing. 2. The inflator device according to claim 1 wherein the filter housing comprises a base portion and a top portion, wherein the filter is disposed between the base portion and the top portion. 3. The inflator device according to claim 1 having a form of a flattened, disk-shaped circular cylinder shaped and sized for driver side placement within a vehicle steering wheel. 4. The inflator device according to claim 1 additionally comprising an initiator diffuser disposed between the initiator device and the supply of gas generant material, the initiator diffuser including a plurality of radially oriented diffuser discharge openings disposed in discharge orientation toward the reaction housing side wall. 5. The inflator device according to claim 1 additionally comprising an injection-molded material surrounding at least a portion of the initiator device, wherein the initiator device is connected to the reaction housing by the injection-molded material. 6. The inflator device according to claim 1 wherein the reaction housing side wall comprises a ridge on an outer side, and a portion of the filter housing is disposed around the reaction housing side wall and abutting the ridge. 7. The inflator device according to claim 1 wherein none of the strainer discharge openings are directly aligned with any of the reaction housing discharge openings. 8. The inflator device according to claim 1 additionally comprising a sealing member disposed between the strainer element and the reaction housing side wall. 9. An inflator device for an inflatable cushion restraint system, the inflator device comprising: a cylindrical reaction housing defining a reaction chamber containing a supply of gas generant material, the reaction housing having a side wall including a plurality of reaction housing discharge openings, wherein upon reaction initiation of the supply of gas generant material, inflation gas is produced and discharges from the reaction chamber through the reaction housing discharge openings; a strainer element disposed within the reaction housing and between the supply of gas generant material and the plurality of reaction housing discharge openings, the strainer element comprising a strainer side wall aligned with the reaction housing side wall and including a plurality of strainer discharge openings, wherein none of the strainer discharge openings are directly aligned with any of the reaction housing discharge openings; an initiator device in reaction initiating communication with the supply of gas generant material; a filter housing comprising a base portion and a top portion and at least in part defining a filter chamber, the filter housing base portion disposed around and secured to the reaction housing side wall, the filter housing top portion attached to an end of the reaction housing side wall; a filter housing discharge opening formed between the filter housing base portion and top portion; and a filter disposed in the filter chamber and external of the reaction housing. 10. The inflator device according to claim 9 wherein the reaction housing includes a ridge extending around an outer surface of the side wall, and the filter housing base portion is disposed around the reaction housing side wall and abutting the ridge. 11. The inflator device according to claim 10 wherein the filter housing base portion is held against the ridge by the filter and the filter is held against the filter housing base portion by the filter housing top portion. 12. The inflator device according to claim 9 wherein the filter housing discharge opening comprises an annular discharge opening. 13. The inflator device according to claim 9 wherein the filter is not disposed over any of the plurality of reaction housing discharge openings. 14. The inflator device according to claim 9 wherein the filter housing base portion comprises a shoulder extending into the filter chamber, the shoulder including a first shoulder face and a second shoulder face extending at an angle from the first shoulder face, and the filter abuts the first shoulder face and the at least one of the plurality of reaction housing discharge openings is in discharge orientation toward the second shoulder face. 15. The inflator device according to claim 9 wherein the filter housing top portion is welded to the reaction housing side wall end. 16. The inflator device according to claim 9 additionally comprising an initiator diffuser disposed between the initiator device and the supply of gas generant material, the initiator diffuser including a plurality of radially oriented diffuser discharge openings disposed in discharge orientation toward the reaction housing side wall. 17. The inflator device according to claim 9 wherein the inflator device has a toroidal shape for driver side placement within a vehicle steering wheel.