| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Cleaning | |
| #2 | Unspecified technologies | |
| #3 | Sewers | |
| #4 | Pipes | |
| #5 | Clutches and brakes | |
| #6 | Unspecified technologies | |
| #7 | Drying solid materials by removing liquid | |
| #8 | Belts or cables for driving | |
| #9 | Hinges for doors or windows | |
| #10 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Robinson Lawrence R | 16 |
| #2 | Robinson Kyle I | 14 |
| #3 | Lang Walter S | 7 |
| #4 | Berger Earl O | 7 |
| #5 | Williams Raymond H | 1 |
| #6 | Irwin Robinson Kyle | 1 |
| #7 | Morris Fred C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2767415A | Pipe cleaning apparatus for gas lines | |
| US2640213A | Hydraulic propelling unit for pipe cleaners | |
| US2478711A | Pipe coating apparatus | |
| US2641010A | Rotary cutter device for pipe cleaners | |
| US2454008A | Sewer cleaning bucket for passing around sheaves | |
| US2504730A | Plowlike scraper for cleaning interior surfaces of water mains and other pipes | |
| US2502593A | Sewer bucket emptying hoist | |
| US2514339A | Pipe-cleaning seal | |
| US2474690A | Flexible connector | |
| US2323727A | Pipe cleaning cutter | |
| US2297167A | Coupling | |
| US2266659A | Chuck | |
| US2234504A | Coiled wire coupling | |
| CA467740A | Hoists | |
| CA418438A | Pipe cleaning cutter | |
| CA455211A | Flexible connector | |
| CA397480A | Coiled wire coupling | |
| CA410653A | Driving member coupling |