| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | France | 4 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Civil engineering | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Explosive charges | |
| #2 | Unspecified technologies | |
| #3 | Mining | |
| #4 | Venting or aerating devices | |
| #5 | Blasting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Filstrup Jr Edward C | 3 |
| #2 | Filstrup Edward C | 3 |
| #3 | Armstrong Frank H | 2 |
| #4 | Jr Edward C Filstrup | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB756829A | Improvements in or relating to gas-pressure blasting devices | |
| US2778309A | Gas pressure blasting device | |
| US2591529A | Compressed air coal breaker | |
| US2750886A | Gas pressure blasting device | |
| US2630826A | Control for charging fluid containers | |
| US2591528A | Pressure responsive valve | |
| US2527291A | Gas pressure blasting device | |
| US2502694A | Air blast device |