Portable electric lamp
CA 1071602 A · Owner: Oldham Batteries Limited · Inventors: Morton, Harold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A portable electric lamp. The lamp has a body including a lens, a lens holder, a reflector, and a bulb holder connectable through a switch with a source of electric power. A translucent diffuser sleeve is co-axial with and surrounds the bulb holder. The sleeve is associated with a drive so that it may be moved axially relative to the bulb holder between a retracted position at which a bulb held in the bulb holder is arranged to direct a spot beam through the lens and a forward position at which light from the bulb is diffused by passage through the diffuser sleeve. The lamp can provide a beam of light and a spread of light for local work. It is particularly useful in mines. It may be …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.