The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 1980
Filed:
Mar. 05, 1979
Joseph W Brown, Blue Springs, MO (US);
Other;
Abstract
A spirometer comprises an upright, hollow frame structure having opposite end portions with an expansible and contractible bellows therein responsive to exhalation and inhalation. The bellows includes a hollow, resilient helical structure with a plurality of coils respectively having relatively broad upper and lower surfaces and relatively thin outer edges. Opposite end members close the helical structure, one of the closing end members being connected to one of the frame structure end portions for suspending the bellows inside the frame structure. A sheet of thin, fluid-impervious film extends the length of the helical structure when the helical structure is expanded and is heat shrunk onto the coils for forming convolutions engaging the upper and lower surfaces and outer edges. The sheath joins the opposite closed end members and defines an impervious outer wall structure for the bellows. A passage is connected to one of the closed end members and communicates with the bellows interior for transmitting inhalation and exhalation pressures thereto.