Patents by Inventor Bruce R. MacDermott

Bruce R. MacDermott has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4672857
    Abstract: A pipet for dispensing liquids comprises a handle with a central bore, an operating shaft supported in the upper end of the handle for sliding movement in the bore, a rod supported coaxially within the bore for reciprocal movement along the handle axis and selectively coupled to the operating shaft when the shaft is moved downwardly in the bore, and a dispensing tip having a passage therethrough and a plunger supported for reciprocal movement in the passage.
    Type: Grant
    Filed: September 10, 1985
    Date of Patent: June 16, 1987
    Assignee: Labindustries, Inc.
    Inventor: Bruce R. MacDermott
  • Patent number: 4501163
    Abstract: A liquid micro-dispensing pipet consisting of a main barrel with a snap-on dispensing tube tip. An axial, upwardly spring-biased operating shaft is slidably and rotatably engaged in the barrel, connected to a plunger in the dispensing tip. The snap-on tip can be at times disengaged from the barrel by exerting axial downward force on the shaft. Stop means to limit the intake movement of the plunger is provided, said stop means consisting of an abutment sleeve slidably and non-rotatably mounted on the upper portion of the shaft and threadedly engaged in the barrel, the abutment sleeve being engageable from below by a stop washer secured on the shaft, which is normally urged upwardly by its biasing spring. The normal elevated position of the plunger can be varied by rotating the barrel relative to the shaft.
    Type: Grant
    Filed: August 30, 1983
    Date of Patent: February 26, 1985
    Inventors: Bruce R. MacDermott, Justin J. Shapiro
  • Patent number: 4415101
    Abstract: A liquid repetitive dispensing device consisting of a main body containing an elongated square ratchet bar slidably engaged with the main body, the ratchet bar having two adjacent longitudinal faces having ratchet teeth of different pitch. A push button is provided in the main body having an inclined bore containing a spring-biased pawl drivingly engageable with the ratchet teeth responsive to inward movement of the push button. An abutment bushing surrounds and conformably receives the ratchet bar and is adjustably rotatably received in the main body. The bushing is formed with inclined bottom cam surfaces extending toward the ratchet teeth and being engageable by the pawl. The degree of driving engagement of the pawl with the teeth is in accordance with the axially adjusted position of the bushing. A yieldable detent in the main body is selectively receivable in axially spaced recesses in the bushing to lock it in adjusted position relative to the main body.
    Type: Grant
    Filed: January 22, 1982
    Date of Patent: November 15, 1983
    Inventors: Justin J. Shapiro, Bruce R. MacDermott