| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 9 | |
| #2 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Packaging and shipping | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Lifting and pushing | |
| #2 | Unspecified technologies | |
| #3 | Winches | |
| #4 | Cranes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Palka Joseph F | 12 |
| Publication | Filing date | Title |
|---|---|---|
| US2884226A | Cable and ratchet wheel lifting jack | |
| US2887290A | Lifting jack supports | |
| US2887289A | Lifting jacks and supports therefor | |
| US2784939A | Lifting jack | |
| US2790621A | Lifting jack and support therefor | |
| US2790615A | Lifting jack support | |
| US2719697A | Cable and ratchet wheel lifting jack | |
| US2719696A | Cable and ratchet wheel lifting jack | |
| US2608382A | Lifting jack | |
| CA560894A | Lifting jack support | |
| CA511339A | Lifting jacks | |
| CA560893A | Lifting jack and support therefor |