David J. Martin

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St. Paul, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Stackable tray for paper stock and drawings
- Patent number D348284
- Issue date Jun 28, 1994
- Liberty Diversified Industries
- Stanley R. Thorud
- D19 - Office supplies
Information Patent Grant
Stackable and reversible trays for storing drawing sheets, paper st...
- Patent number 5,318,182
- Issue date Jun 7, 1994
- Liberty Diversified Industries
- Stanley R. Thorud
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Printer stand
- Patent number 4,568,212
- Issue date Feb 4, 1986
- Liberty Diversified Industries, Inc.
- Donald R. Cooke
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS

Patents Applicationslast 30 patents

Information Patent Application
Production of glass sand
- Publication number 20230278908
- Publication date Sep 7, 2023
- Cynthia Andela
- B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...