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:
Aug. 27, 1985
Filed:
Jul. 06, 1982
Charles R Luper, Anaheim, CA (US);
Sensormedics Corporation, Anaheim, CA (US);
Abstract
A calibration syringe for controllably delivering gas to a respiratory gas measuring instrument during the calibration thereof. In addition to the piston and cylinder arrangement used in prior syringes, the calibration syringe of the invention includes several improvements which enhance the accuracy and repeatability of the volume of gas delivered thereby. One improvement comprises a modified inlet-outlet design which assures a positive shutoff of the flow of gas at the end of an ejection stroke. A second improvement comprises the provision of a spring-loaded mechanism for automatically propelling the piston at any of several operator selectable rates. Finally, the calibration syringe of the invention includes a latching arrangement which assures that each ejection stroke begins from the same starting position and is initiated in a way that minimizes operator-related effects.