| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 | |
| #2 | Canada | 9 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Gearing | |
| #2 | Unspecified technologies | |
| #3 | Making gears or toothed racks | |
| #4 | Mechanical control devices | |
| #5 | Frames |
| # | Name | Total Patents |
|---|---|---|
| #1 | Acker George H | 16 |
| #2 | Fitzpatrick David | 1 |
| #3 | David Fitzpatrick | 1 |
| #4 | Noble Warren | 1 |
| #5 | Anderson Russell G | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2113868A | Reduction gear | |
| US2175047A | Reduction gear control | |
| US2147391A | Reduction gear | |
| US1995288A | Worm gear reduction unit | |
| US1902934A | Gear casing | |
| US1972911A | Worm gear reduction unit | |
| US1802545A | Differential | |
| US1639680A | Machine element | |
| US1564742A | Worm-gear reduction unit | |
| US1648470A | Hob for worm gears | |
| US1436159A | Hob for worm gears | |
| CA427561A | Magnetic drain plug | |
| CA353666A | Worm gear reduction unit | |
| CA347346A | Worm gear reduction unit | |
| CA441855A | Worm gear reduction unit | |
| CA300778A | Machine element | |
| CA300779A | Worm geared reduction unit | |
| CA394803A | Reduction gear | |
| CA379903A | Reduction gear | |
| CA209319A | Thread grinder |