David W. O'Brien

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North Ridgeville, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Electrical impulse hot hole punch for making a tear-resistant hole...
- Patent number 5,140,133
- Issue date Aug 18, 1992
- Clamco Corporation
- David W. O'Brien
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Film wrapping apparatus
- Patent number 5,134,835
- Issue date Aug 4, 1992
- Clamco Corporation
- Zigmunt J. Walkiewicz
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL