| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 17 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Machine tools | |
| #3 | Civil engineering | |
| #4 | Machines | |
| #5 | Environmental technology | |
| #6 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Air-conditioning | |
| #2 | Roof coverings | |
| #3 | Punching metal | |
| #4 | Forging | |
| #5 | General building constructions | |
| #6 | Shaping of plastics | |
| #7 | Presses | |
| #8 | Unspecified technologies | |
| #9 | Combustion residues removal | |
| #10 | Clutches and brakes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Filkins Arthur J | 8 |
| #2 | Caswell Frederick K | 6 |
| #3 | Harold Knutson | 2 |
| #4 | Meaden John A | 1 |
| #5 | Carney Maurice | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2311654A | Roof drain | |
| US2328332A | Damper | |
| US2121220A | Roof drain | |
| US1828052A | Pipe damper | |
| US1728494A | Ventilator | |
| US1711523A | Floor vent | |
| US1690001A | Floor vent | |
| US1648014A | Floor vent | |
| US1200331A | Smoke-jack. | |
| US1202402A | Portable metal building. | |
| US1138726A | Chimney. | |
| US937226A | Metal-working power-press. | |
| US1003231A | Brake-shoe machine. | |
| US973168A | Process for making brake-shoes. | |
| US973169A | Brake-shoe machine. | |
| US973167A | Automatic brake-shoe machine. | |
| US860279A | Brake-shoe. |