John D. Toppen

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Cincinnati, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Window shade clutch assembly
- Patent number 4,427,050
- Issue date Jan 24, 1984
- Clopay Corporation
- John D. Toppen
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS