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:
May. 03, 1983
Filed:
Mar. 06, 1981
Wilbur M Swanson, St. Louis County, MO (US);
Washington University, St. Louis, MO (US);
Abstract
Apparatus and methods for durability (fatigue) testing of various samples (materials, valves, components and other objects) involves use of a test fixture for clamping a sample to be tested in a closed fluid environment and providing fluid passages on opposite sides of the object to be tested through which a bellows-actuated fluid oscillator causes axial oscillating flow of fluid, causing the sample to undergo repeated bidirectional axial pressures producing flexing in the case of a membrane of elastic material or repeated closing and opening in the case of a valve, etc., in response to oscillation of the fluid in the passages. The device is particularly suited for 'blister testing' of elastomers and for life testing of prosthetic heart valves and other valves.