| Patents for Harold Walker Pearn |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| GB-191,302,571 | Aug. 21, 1913 | H.W. Pearn | Improvement in a relating to apparatus for facing valves | metalworking machines |
| GB-204,589 | Oct. 04, 1923 | H.W. Pearn | Improvements in variable speed and reversing gearing | metalworking machine gearing |
| CA-239,508 | Apr. 22, 1924 | H.W. Pearn | Variable speed and reversing gearing | metalworking machine gearing |
| GB-221,074 | Sep. 04, 1924 | H.W. Pearn | Improvements relating to direct acting pumps and compressors | pumps |
| GB-221,351 | Sep. 11, 1924 | H.W. Pearn | Improvements in apparatus for raising liquids | pumps |
| GB-249,682 | Apr. 01, 1926 | H.W. Pearn | Improvements relating to speed reduction gearing | metalworking machine gearing |
| GB-258,113 | Sep. 16, 1926 | H.W. Pearn | Improvements in variable speed gearing | metalworking machine gearing |
| GB-275,514 | Aug. 11, 1927 | H.W. Pearn | Improvements relating to vertical shaft couplings | pumps |
| GB-288,949 | Apr. 19, 1928 | H.W. Pearn | Improvements relating to reciprocating pumps | pumps |
| GB-322,120 | Nov. 28, 1929 | H.W. Pearn | Improvements relating to centrifugal pumps | pumps |
| GB-386,048 | Jan. 12, 1933 | H.W. Pearn | Improvements in and relating to direct acting pumps | steam pumps |
| GB-456,179 | Nov. 04, 1936 | H.W. Pearn | Improvements in or relating to the coupling together of shafts and pump rods | pumps |
| GB-499,981 | Feb. 01, 1939 | H.W. Pearn | Improvements relating to pump valves | pumps |
| GB-524,628 | Aug. 12, 1940 | H.W. Pearn | Improvements relating to stuffing boxes for shafts or spindles | pumps |
