David A. Spence

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Hartland, WI, US

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Patents Grantslast 30 patents

Information Patent Grant
Roadworthy rail ballast regulator
- Patent number 9,938,669
- Issue date Apr 10, 2018
- Nordco Inc.
- James William Boyd
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Target pedestal assembly and method of preserving the target
- Patent number 7,835,502
- Issue date Nov 16, 2010
- TomoTherapy Incorporated
- David Arthur Spence
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Method and apparatus for calibrating a radiation therapy treatment...
- Patent number 7,801,269
- Issue date Sep 21, 2010
- TomoTherapy Incorporated
- Robert L. Cravens
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE

Patents Applicationslast 30 patents

Information Patent Application
ROADWORTHY RAIL BALLAST REGULATOR
- Publication number 20160108582
- Publication date Apr 21, 2016
- NORDCO INC.
- James William BOYD
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Application
RAILWAY REFERENCE MACHINE HAVING A COLLAPSIBLE PROJECTOR ASSEMBLY
- Publication number 20150083914
- Publication date Mar 26, 2015
- NORDCO INC.
- David A. Spence
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Application
TARGET PEDESTAL ASSEMBLY AND METHOD OF PRESERVING THE TARGET
- Publication number 20100202593
- Publication date Aug 12, 2010
- TomoTherapy Incorporated
- David Arthur Spence
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
Amorphous selenium detector for tomotherapy and other image-guided...
- Publication number 20060138339
- Publication date Jun 29, 2006
- Guang Y Fang
- G01 - MEASURING TESTING