Robert L. Stewart

Follow

Person

Brookfield, VT, US

People

Patents Grantslast 30 patents

Information Patent Grant
Venting system for insulating window shade
- Patent number 4,497,436
- Issue date Feb 5, 1985
- Appropriate Technology Corporation
- Daniel L. Ingold
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS