| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 23 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Civil engineering | |
| #3 | Machines | |
| #4 | Machine tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Covell Harold S | 7 |
| #2 | De Roo William C | 7 |
| #3 | Heasley Loyd E | 4 |
| #4 | Cole Nelson E | 3 |
| #5 | Hart Howard S | 2 |
| #6 | Alsburg Jerold H Van | 2 |
| #7 | Conrad Lohman | 1 |
| #8 | Kietzmann Alfred E | 1 |
| #9 | Heasley Lloyd E | 1 |
| #10 | Stanley Hart | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2541346A | Furnace volume control | |
| US2566558A | Furnace register frame | |
| US2473053A | Register construction | |
| US2446356A | Window stool air outlet | |
| US2504472A | Air distributor | |
| US2464442A | Register construction | |
| US2314034A | Grille bar key | |
| US2285984A | Directional grille | |
| US2282946A | Register | |
| US2194113A | Grille construction | |
| US2255616A | Directional grille | |
| US2204356A | Grille | |
| US2147283A | Heating device | |
| US2139893A | Adjustable register | |
| US2057494A | Adjustable directional grille | |
| US2000274A | Honeycomb directional grille | |
| US2011797A | Plaster frame for wall registers or grilles | |
| US2017306A | Register | |
| US1922365A | Friction hinge | |
| US1815346A | Furnace register |