A self-contained window unit that may be installed in a solid fuel burner or like device. The window unit comprises a safety shield which may consist of a glass pane and/or a safety screen, and a frame surrounding the safety shield. The frame is composed of frame elements fabricated in separate lengths...http://www.google.co.uk/patents/US4384567?utm_source=gb-gplus-sharePatent US4384567 - Self-contained window unit for solid fuel burner
