| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Measurement | |
| #4 | Control | |
| #5 | Electrical machinery and energy | |
| #6 | Chemical engineering | |
| #7 | Packaging and shipping | |
| #8 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Weighing | |
| #3 | Systems controlling non-electric variables | |
| #4 | Pumps | |
| #5 | Mixing | |
| #6 | Transport or storage devices | |
| #7 | Compressed gas holders | |
| #8 | Electric switches | |
| #9 | Gearing | |
| #10 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Harper Lyndus E | 13 |
| #2 | Coffman Jr Paul A | 1 |
| #3 | Coffman Paul A Jr | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2662665A | Controlling apparatus | |
| US2626728A | Proportioning device | |
| US2626787A | Proportioning device | |
| US2552783A | Housed gas supply with gas weighing means | |
| US2637434A | Belt type gravimetric feeder | |
| US2435039A | Disk feeder having material scraper and material agitators | |
| US2404231A | Variable-speed transmission | |
| US2364519A | Timing device | |
| US2355862A | Self-closing valve | |
| US2346964A | Positive displacement pump | |
| CA503180A | Belt type gravimetric feeder | |
| CA448795A | Flexible tube pump | |
| CA440135A | Self closing valve | |
| CA501905A | Housed gas supply | |
| CA444756A | Timing device |