The following patents have been granted to Gregory Van Hale by the United States Patent and Trademark Office.  Clicking on the links will take you to the USPTO web site and the general abstract for each patent.

• Dental Hand Piece # 5,342,196 - august 30, 1994

  TECHNICAL SPECS DRAWING FIGURE 1
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• Dental aspiration unit # 5,531,722 - July 2, 1996

  TECHNICAL SPECS DRAWING FIGURE 1
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• Dental Hand Piece # 5,554,026 - September 10, 1996

  TECHNICAL SPECS DRAWING FIGURE 1
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• Dental aspiration unit # 6,585,512 - July 1, 2003
  
  TECHNICAL SPECS DRAWING FIGURE 1
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ENGINEERING BLUEPRINTS OF DENTAL ASPIRATION UNIT FIGURE 1
ENGINEERING BLUEPRINTS OF DENTAL ASPIRATION UNIT FIGURE 2

• PROTECTIVE BARRIER #7,037,110 B1  - MAY 2, 2006
  
  TECHNICAL SPECS DRAWING FIGURE 1
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