| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | Canada | 2 | |
| #3 | France | 2 | |
| #4 | Denmark | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Thermal processes | |
| #3 | Mechanical elements | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Domestic heating systems | |
| #2 | Unspecified technologies | |
| #3 | Venting or aerating devices | |
| #4 | General building constructions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hoffman George D | 5 |
| #2 | Allen Everett P | 4 |
| #3 | Hoffman George Delos | 2 |
| #4 | Bard George M | 2 |
| #5 | Allen Everett F | 1 |
| #6 | Rowe John W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1083933A | Air-valve for radiators. | |
| US992195A | Valve. | |
| US899111A | Automatic air-valve. | |
| US899110A | Automatic air-valve. | |
| US958716A | Valve. | |
| US899077A | Relief-valve. | |
| US967381A | Air-vent valve. | |
| US901242A | Air-vent valve. | |
| US957593A | Radiator-valve. | |
| US933225A | Radiator-valve. | |
| US957592A | Valve. | |
| CA87548A | Valve | |
| CA87549A | Valve for steam heating systems | |
| US945433A | Valve. | |
| US933222A | Quick-acting radiator-valve. |