| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 | |
| #2 | United Kingdom | 4 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machine tools | |
| #3 | Machines | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Nails | |
| #2 | Handles for hand implements | |
| #3 | Percussive tools | |
| #4 | Earth drilling | |
| #5 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Gelpcke Alfred W | 9 |
| #2 | Schulte Max L | 1 |
| #3 | Walter Gelpcke Alfred | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2567372A | Toggle lock | |
| US2398220A | Toggle lock | |
| US2406536A | Drilling anchor part for bolts or screw studs and its use | |
| US2326453A | Screw anchor | |
| US2217202A | Percussion drill | |
| US2120577A | Machine screw anchor | |
| GB382263A | Improvements in or relating to removable grips for tool holders | |
| US1957533A | Bolt anchor | |
| US1940856A | Bolt anchor | |
| US1936624A | Locking cap for fasteners | |
| US1852297A | Bolt anchor | |
| US1852296A | Removable grip for tool holders | |
| GB306203A | Improvements in and relating to wall plugs and apparatus for the manufacture of the same |