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
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.