Pitch tester

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Description

FIG. 1 is a front elevational view of pitch tester showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a right side elevational view, the left side elevational view being a mirror image;

FIG. 4 is a rear elevational view; and

FIG. 5 is a top and right-front perspective view thereof.

Referenced Cited
U.S. Patent Documents
D250834 January 16, 1979 Ruppent
D264873 June 8, 1982 Olson et al.
D281310 November 12, 1985 Hattori et al.
D303095 August 29, 1989 Nagai et al.
D304307 October 31, 1989 Nagai et al.
2472419 June 1949 Green
4004782 January 25, 1977 Jeppsen
4675163 June 23, 1987 Mybeck
4676951 June 30, 1987 Armes et al.
4692308 September 8, 1987 Riley et al.
Other references
  • Ernst Back, "The Mechanism of Pulp Resin Accumulation at Solid Surfaces", Svensk Paperstidning, 63 (1960): 17, 556. Stroele et al., "Combating Pitch Problems with dispersing Agents" (Das Papier, 10: 264-270 (1956)) (English translation enclosed). Chene et al., "Pitch Deposition in the Paper Mill", Assoc. Tech. Ind. Papetiere, Bull. 19(6):229-234 (1965).
Patent History
Patent number: D311875
Type: Grant
Filed: Sep 25, 1987
Date of Patent: Nov 6, 1990
Assignee: Buckman Laboratories, Inc. (Memphis, TN)
Inventors: Gerald M. Dykstra (Memphis, TN), William T. Winford, Jr. (Memphis, TN)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoine D. Davis
Law Firm: Finnegan, Henderson, Farabow, Garrett & Dunner
Application Number: 7/101,167
Classifications
Current U.S. Class: Chemical (12) (D10/81)