| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 86 | |
| #2 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Medical technology | |
| #2 | Electrical machinery and energy | |
| #3 | Machines | |
| #4 | Engines, pumps and turbines | |
| #5 | Control |
| # | Technology | |
|---|---|---|
| #1 | Dentistry | |
| #2 | Operating tables | |
| #3 | X-ray technique | |
| #4 | Unspecified technologies | |
| #5 | Dynamo-electric machines | |
| #6 | Electric switches | |
| #7 | Diagnosis and surgery | |
| #8 | Electric motor controls | |
| #9 | Pumps | |
| #10 | Control or regulating systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pieper Oscar H | 89 |
| #2 | Pieper Alphonse F | 56 |
| #3 | Piefer Alphonse F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2261036A | Unitary dental apparatus | |
| US2214775A | Unitary dental apparatus | |
| US2140299A | Regulator apparatus for X-ray machines | |
| US2029584A | Connecter for x-ray tubes | |
| US2131297A | Cord strain relief means | |
| US2133332A | Dental unit | |
| US2036098A | Fluid compressor | |
| US2021518A | Dental apparatus | |
| US1959964A | Dental apparatus | |
| US1979997A | X-ray machine | |
| US2024182A | X-ray machine | |
| US1974929A | X-ray apparatus | |
| US1949760A | X-ray apparatus | |
| US2086045A | X-ray apparatus | |
| US1835961A | Dental handpiece | |
| US1911386A | Dental apparatus | |
| US1850851A | Heated dental instrument | |
| US2036096A | X-ray apparatus | |
| US1941270A | X-ray apparatus | |
| US1840636A | Unitary dental apparatus |