Donald D. Davis

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Rochester, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Window sash counterbalance with varying lift
- Patent number 5,267,416
- Issue date Dec 7, 1993
- Caldwell Manufacturing Company
- Donald D. Davis
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Window sash balance with tension and torsion spring
- Patent number 5,152,032
- Issue date Oct 6, 1992
- Caldwell Manufacturing Company
- Donald D. Davis
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES