| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Measurement | |
| #3 | Environmental technology | |
| #4 | Machines | |
| #5 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Measuring volume | |
| #3 | Unspecified technologies | |
| #4 | Venting or aerating devices | |
| #5 | Water treatment |
| # | Name | Total Patents |
|---|---|---|
| #1 | Leopold Frederick B | 4 |
| #2 | Jones Llewellyn W | 4 |
| #3 | Brown Charles Arthur | 2 |
| #4 | Hansen Paul | 2 |
| #5 | Humphreys Charles A | 1 |
| #6 | Leopold Frederick Bernard | 1 |
| #7 | Knight Gerald W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1338504A | Loss-of-head gage | |
| US891998A | Concrete manifold system. | |
| US871226A | Water-softener apparatus. | |
| US900551A | Water-softener. | |
| US871225A | Water-softener. | |
| US857563A | Apparatus for feeding lime to water. | |
| US857564A | Method of feeding lime to water. | |
| CA109350A | Strainer | |
| US859455A | Strainer. | |
| US879876A | Filter. | |
| US804532A | Outlet-controller for filters. |