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PL Robertson Manufacturing Co Ltd

PL Roberts

Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US3370501A	Nut receiving piercing self-tapping screw	Expired / Lapsed	1965-10-22	1968-02-27	0	Details
US3136205A	Self-tapping wood screw	Expired / Lapsed	1962-02-19	1964-06-09	2	Details
US2936010A	Screw driver bit	Expired / Lapsed	1956-12-17	1960-05-10	0	Details
CA485160A	Magnetic tool	Expired / Lapsed	—	1952-07-22	0	Details