Miniature gas chromatograph apparatus

Patent 4474889 Issued on October 2, 1984. Estimated Expiration Date:

April 26, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3138025

3138948

3333470

3538744

3633426

3911386

Hydrocarbon concentration sensor for use in engine exhaust gas
Patent #: 4033169
Issued on: 07/05/1977
Inventor: Fujishiro , et al.

Nitrogen dioxide sensing element and method of sensing the presence of nitrogen dioxide
Patent #: 4142400
Issued on: 03/06/1979
Inventor: Colla , et al.

Combustible gas detecting element
Patent #: 4241019
Issued on: 12/23/1980
Inventor: Nakatani , et al.

Repetitive chromatographic apparatus Patent #: 4359891
Issued on: 11/23/1982
Inventor: Ahlstrom, Jr. , et al.

Inventors

Assignee

Microsensor Technology Inc.

Application

No. 06/371617 filed on 04/26/1982

US Classes:

436/161, INCLUDING CHROMATOGRAPHY422/89, Gas chromatography73/23.42, Detail of gas handling means96/106Having system connector or coupling

Examiners

Primary: Marantz, Sidney

Attorney, Agent or Firm

Limbach, Limbach & Sutton

International Classes

G01N 30/00 (20060101)
G01N 30/60 (20060101)
G01N 30/88 (20060101)
G01N 30/20 (20060101)

Abstract

A gas chromatography assembly has a substrate wafer with grooves and a valve seat etched therein. A plate cooperates with the wafer and the grooves to define gas channels: a carrier gas channel and a sample gas channel, each passing through the valve seat. A valve actuator is attached to the valve seat for controlling the flow of sample gas from the sample gas channel into the carrier gas channel. A pump is attached to the wafer and is connected to the sample gas channel. The pump cooperates with the valve actuator to inject sample gas from the sample gas channel into the carrier gas channel. A modular capillary tube and a detector are connected to the carrier gas channel to analyze the properties of the sample gas flowing in the carrier gas channel from the sample gas channel.

Other References

Terry, Steven C. et al., IEEE Trans. Electron Devices, vol. Ed.-26, No. 12, 1880-1886 (Dec. 1979)
Chemical Abstracts, 90: 97088d (1979)
S. C. Terry et al., Theory, Des., Biomed. Appl. Solid State Chem. Sens., Workshop 1977 (Pub. 1978), 207-218 (Eng), edited by Cheung, Peter W.; Fleming, David G.; Neuman, Michael R., CRC: West Palm Beach, Fla
"A Feasibility Study of a Pocket-Sized Gas Chromatographic Air Analyzer" by Stephen C. Terry & John H. Jerman; Jul. 1977
"A Prototype Gas Analysis System Using a Miniature Gas Chromatograph" by James B. Angell, et al., Apr. 1981
"A Prototype Gas Analysis System Using a Miniature Gas Chromatograph" by John H. Jerman, et al., Jun. 1, 1980
"Developments in Micro Gas Chromatography" by W. F. Wilhite, J. of G.C.-Feb. 1966, p. 47
"A New Detector for Gaseous Components Using Semiconductive Thin Films", Analytical Chemistry, vol. 34, No. 11, Oct. 1962
"Vacuum Ultraviolet Photochemistry in Thin Resist Films" by Paul W. Bohn & James W. Taylor, Analytical Chemistry, vol. 53, No. 7, Jun. 1981, pp. 1082-1087
"Study on a Detector for Gaseous Components Using Semiconductive Thin Films", vol. 38, No. 8, Jul. 1966