TREA

Pitch tester

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Information

  • Patent Grant
  • D311875
  • Patent Number
    D311,875
  • Date Filed
    Friday, September 25, 1987
    36 years ago
  • Date Issued
    Tuesday, November 6, 1990
    33 years ago
  • US Classifications
    Field of Search
    • US
    • D10 81
    • D10 75
    • 073 63
    • 073 86324
    • 073 8658
    • 366 14
    • 366 15
    • 366 53
    • 366 54
    • 366 91
    • 366 140
    • 366 142
    • 366 141
    • 366 241
    • 422 50
    • 422 55
    • 422 61
    • 422 62
    • 422 64
    • 422 681
    • 422 102
    • 422 104
    • 422 119
    • 422 224
    • 422 225
    • 422 257
    • Term of Grant
      14Years
Information
Abstract
Description
Claims
  • The ornamental design for a pitch tester, as shown and described.
US Referenced Citations (10)
Number Name Date Kind
D250834 Ruppent Jan 1979
D264873 Olson et al. Jun 1982
D281310 Hattori et al. Nov 1985
D303095 Nagai et al. Aug 1989
D304307 Nagai et al. Oct 1989
2472419 Green Jun 1949
4004782 Jeppsen Jan 1977
4675163 Mybeck Jun 1987
4676951 Armes et al. Jun 1987
4692308 Riley et al. Sep 1987
Non-Patent Literature Citations (3)
Entry
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).