04266540 is referenced by 124 patents and cites 8 patents.

An oxygen mask which covers only a patient's nose is attached to the patient by a flexible strap. A clip is attached to the outer surface of the mask to hold the portion of the mask firmly in place relative to the bridge of the patient's nose. An exhaust port is included in the mask. The mask also includes an integral mixing valve for mixing air and gas such as oxygen to achieve a prescribed percentage mixture as may be required for patient therapy. The mixing valve is supported by a support member attached to the mounting strap.

Title
Nasal oxygen therapy mask
Application Number
5/951744
Publication Number
4266540
Application Date
October 13, 1978
Publication Date
May 12, 1981
Inventor
David Smith
P.O. Box 197, Avoca, 14809
NY, US
Donald Panzik
47 Ballantine Rd., Rochester, 14623
NY, US
Agent
George E Clark
IPC
A61M 15/00
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