| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 2 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Thread cutting | |
| #3 | Turning | |
| #4 | Spark gaps and corona devices | |
| #5 | Accessories for machine tools | |
| #6 | Making forged metal products |
| # | Name | Total Patents |
|---|---|---|
| #1 | Otto Hoelzel | 2 |
| #2 | Gates William H | 2 |
| #3 | Warren Levi G | 2 |
| #4 | Bettcher Carl W | 2 |
| #5 | Williamson Edwin O | 1 |
| #6 | Laemmel Charles H | 1 |
| #7 | Malcolm Elton O | 1 |
| #8 | William Son Edwin O | 1 |
| #9 | Cox Thomas F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2026471A | Die head | |
| US2054592A | Feed pusher | |
| GB411025A | Improvements in or relating to screw-thread cutting die heads | |
| US1937418A | Die head | |
| US1846296A | Self-opening die head | |
| US1742913A | Die head | |
| US1714684A | Rod-feeding device | |
| US1683114A | Thread-correcting device | |
| US1615676A | Die head | |
| US1200185A | Machine for making nipples. | |
| US1141052A | Spark-plug. | |
| CA676508A | Form rolling apparatus | |
| CA351172A | Die head |