| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Engines, pumps and turbines | |
| #5 | Textiles and paper |
| # | Technology | |
|---|---|---|
| #1 | Grinding or polishing devices | |
| #2 | Unspecified technologies | |
| #3 | Shafts | |
| #4 | Typewriters | |
| #5 | Lubricating of machines | |
| #6 | Grinding tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Frank Postma | 12 |
| Publication | Filing date | Title |
|---|---|---|
| US2548445A | Abrading device | |
| US2586379A | Lubrication of engine bearings | |
| US2494056A | Typewriter line scribing device | |
| US2444308A | Crankpin truing device | |
| US2554154A | Bearing lubrication | |
| US2245820A | Abrading device | |
| US2153272A | Abrading liner | |
| US2174213A | Crankpin truing device | |
| US2167312A | Abrading element | |
| US2127528A | Abrading device | |
| US2167311A | Method of abrading crankshafts | |
| US2141823A | Abrading liner |