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:
Nov. 27, 2001
Filed:
Mar. 16, 2001
George E. Sgourakes, Millis, MA (US);
AVGI Engineering, Inc., Millis, MA (US);
Abstract
Differential pressure generator,includes a stacked pair of opposed novel gravity transducers of the inverted-cup falling-cylinder type. First enclosure,contains a first gravity transducer,and second enclosure,contains a second gravity transducer,. First gravity transducer,includes first cylinder,, and first piston,. The first cylinder is mounted for gravity-driven, viscosity-limited motion with respect to the first piston to generate a first pressure difference. The second gravity transducer includes a second cylinder and a second piston. The second cylinder is mounted for gravity-driven, viscosity-limited motion with respect to the second piston to generate a second pressure difference. The first cylinder has a displacement volume that is equal to the displacement volume of the second cylinder, and the first cylinder is heavier than the second cylinder. The first pressure difference and the second pressure difference are summed in opposition to produce a reference differential pressure.