| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 59 | |
| #2 | Canada | 11 | |
| #3 | France | 6 | |
| #4 | United Kingdom | 6 | |
| #5 | Germany | 5 |
| # | Industry | |
|---|---|---|
| #1 | Packaging and shipping | |
| #2 | Machines | |
| #3 | Transport | |
| #4 | Civil engineering | |
| #5 | Mechanical elements | |
| #6 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Lifting and pushing | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Railway equipment | |
| #5 | Machines for making railways | |
| #6 | Workshop equipment | |
| #7 | Railway brakes | |
| #8 | Gearing | |
| #9 | Earth drilling | |
| #10 | Clutches and brakes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kopf John C | 19 |
| #2 | Hindman Isaiah E | 13 |
| #3 | Schwerin Frank H | 13 |
| #4 | Schwerin Frank Henry | 8 |
| #5 | Freed George F | 7 |
| #6 | Alston Walter Mch | 3 |
| #7 | Kopf John Carl | 3 |
| #8 | Hylander Charles E | 3 |
| #9 | Hamersveld John Van | 2 |
| #10 | Mcginley Thomas A | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1637459A | Tie spacer | |
| GB253071A | Self-lowering screw-jack | |
| US1579788A | Self-lowering screw jack | |
| GB243997A | Ratchet jack | |
| US1589000A | Self-lowering screw jack | |
| US1534613A | Ratchet jack | |
| US1524753A | Sill straightener | |
| US1593364A | High-speed-screw jack | |
| US1618232A | Oil-well jack | |
| US1653126A | Mine post or jack | |
| US1552011A | Lifting jack | |
| US1466195A | Trip jack | |
| US1410579A | Lifting jack | |
| US1397871A | Jack | |
| US1546906A | Self-lowering jack | |
| US1397868A | Self-lowering jack | |
| US1397869A | Self-lowering jack | |
| US1546905A | Self-lowering jack | |
| US1397882A | Self-lowering jack | |
| US1397870A | Lifting-jack |