Filter plate

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Description

FIG. 1 is a top plan view of a filter plate showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a front elevational view thereof.

Referenced Cited
U.S. Patent Documents
744761 November 1903 James
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1282414 December 1918 Hagstrom
1540251 September 1925 Buckley et al.
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2473986 September 1949 Booth
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3497065 February 1970 Johnson, Jr.
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3543938 December 1970 Busse et al.
3585131 June 1971 Esmond
3966612 June 29, 1976 Johansson
3988242 October 26, 1976 Kurita et al.
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4235721 November 25, 1980 Hakamura et al.
4310416 January 12, 1982 Tanaka et al.
4411784 October 25, 1983 Esmond
4430218 February 7, 1984 Perl et al.
4540492 September 10, 1985 Kessler
4543187 September 24, 1985 Steppacher
4624784 November 25, 1986 Lefebvre
4735718 April 5, 1988 Peters
4750983 June 14, 1988 Foster et al.
4769140 September 6, 1988 Van Dijk et al.
4867876 September 19, 1989 Kopf
Foreign Patent Documents
1392030 April 1975 GBX
Other references
  • Prostak.TM. Bench Top Development System Lit No. SD200, 8/88. "Toyosoda Ultrafiltration Cassette UF--LABO", undated. "Laboratory Ultrafiltration Products for Improved Biological Recovery", Lit No. AB841, 10/88. "Shorten the Race to the Market with Millipore Pilot and Process Systems", Lit No. SD100, 1/88.
Patent History
Patent number: D324720
Type: Grant
Filed: Jun 9, 1989
Date of Patent: Mar 17, 1992
Inventor: Henry B. Kopf (Cary, NC)
Primary Examiner: Susan J. Lucas
Assistant Examiner: M. H. Tung
Attorney: Steven J. Hultquist
Application Number: 7/364,183
Classifications
Current U.S. Class: Filter Or Strainer (2) (D23/209)