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Patents for Harold Walker Pearn
Patents 1 - 14 of 14
First set of recordsLast set of records
GB-191,302,571Aug. 21, 1913H.W. PearnImprovement in a relating to apparatus for facing valvesmetalworking machines
GB-204,589Oct. 04, 1923H.W. PearnImprovements in variable speed and reversing gearingmetalworking machine gearing
CA-239,508Apr. 22, 1924H.W. PearnVariable speed and reversing gearingmetalworking machine gearing
GB-221,074Sep. 04, 1924H.W. PearnImprovements relating to direct acting pumps and compressorspumps
GB-221,351Sep. 11, 1924H.W. PearnImprovements in apparatus for raising liquidspumps
GB-249,682Apr. 01, 1926H.W. PearnImprovements relating to speed reduction gearingmetalworking machine gearing
GB-258,113Sep. 16, 1926H.W. PearnImprovements in variable speed gearingmetalworking machine gearing
GB-275,514Aug. 11, 1927H.W. PearnImprovements relating to vertical shaft couplingspumps
GB-288,949Apr. 19, 1928H.W. PearnImprovements relating to reciprocating pumpspumps
GB-322,120Nov. 28, 1929H.W. PearnImprovements relating to centrifugal pumpspumps
GB-386,048Jan. 12, 1933H.W. PearnImprovements in and relating to direct acting pumpssteam pumps
GB-456,179Nov. 04, 1936H.W. PearnImprovements in or relating to the coupling together of shafts and pump rodspumps
GB-499,981Feb. 01, 1939H.W. PearnImprovements relating to pump valvespumps
GB-524,628Aug. 12, 1940H.W. PearnImprovements relating to stuffing boxes for shafts or spindlespumps
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