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- David Grewell. Laser Beam Shaping Using Liquid Crystals. US Patent 6,867,388.
- David Grewell, Justin Bickford, Donald Lovett, Paul Rooney. Light Guide for Laser Welding. US Patent 6,528,755.
- David Grewell, Donald Lovett. Transparent Pressure Bladder. US Patent 6,486,433.
- David Grewell. Distance Mode Control for Laser Welding. US Patent 6,329,629.
- David Grewell. Laser Diode Array. US Patent 6,205,016.
- Don Lovett, David Grewell. Welding Method and Apparatus. US Patent 6,064,798.
- Don Lovett, David Grewell. Welding Method and Apparatus. US Patent 5,949,959.
- David Grewell. Simultaneous Amplitude and Force Profiling During Ultrasonic Welding of Thermoplastic Workpieces. US Patent 5,855,706.
- Jeffrey Frantz, David Grewell. Method for Processing Workpieces by Ultrasonic Energy. US Patent 5,846,377.
- David Grewell. Method of Determining the Collapse of Plastic Parts. US Patent 5,788,791.
- David Grewell. Welding System and Method of Setting Welding Machine Parameters. US Patent 5,772,814.
- Robert Grimm, David Grewell, Mark St. John. Thermoplastic Welding. US Patent 5,313,034.
- Jeffrey Frantz, David Grewell. Method and Apparatus for Processing Workpieces by Ultrasonic Energy. US Patent 5,658,408.
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