CA Patent: 116,463


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CA Patent: CA-116,463

Screw

Patentee:

Peter Lymburner Robertson (exact or similar names) - Hamilton, ON Canada

USPTO Classifications:

Tool Categories:

metalworking machines : screw machines

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Oct. 24, 1907
Granted:	Feb. 02, 1909

Patent Pictures:

CIPO Data
Espacenet patent
Report data errors or omissions to steward Jeff Joslin

Description:

This is the patent for the Robertson screw, which is still the dominant screw type in Canada. The patent actually covers the manufacturing process for the square recess. US patent 975,285 is equivalent to this Canadian patent.