Gas separations utilizing glassy polymer membranes at sub-ambient temperatures

Patent 5679133 Issued on October 21, 1997. Estimated Expiration Date:

October 21, 2014. 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

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3246449

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3899309

Producing gaseous fuels of high calorific value
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Inventor: Jones

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Inventors

Assignee

Dow Chemical Co.

Application

No. 292771 filed on 08/18/1994

US Classes:

95/45, Selective diffusion of gases through substantially solid barrier (e.g., semipermeable membrane, etc.)95/50Organic compound permeates barrier

Examiners

Primary: Spitzer, Robert

Attorney, Agent or Firm

Peters, Verny, Jones & Biksa, L.L.P.

Foreign Patent References

1188630 CA. 06/19/1985
0060693 EP. 09/19/1982
0239235 EP. 09/19/1987
0266698 EP. 05/19/1988
0316960 EP. 05/19/1989
0334114 EP. 09/19/1989
2571270 FR. 10/19/1984
63-215501 JP. 09/19/1988
63-278524 JP. 11/19/1988
01-194904 JP. 11/19/1988
01-194905 JP. 11/19/1988
3-007927 JP. 03/19/1991
2181528 GB. 04/19/1987
2211193 GB. 06/19/1989
WO89/04206 WO. 09/19/1988

International Class

B01D 053/22

Abstract

This invention relates to a method of and apparatus for separating component gases in a gas mixture employing a glassy polymer membrane at temperatures of 5° C. or less so as to achieve superior separation of gas components.

Other References

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