| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Civil engineering | |
| #3 | Transport | |
| #4 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Unspecified technologies | |
| #3 | Railway bodies | |
| #4 | Locks | |
| #5 | Bolts for doors or windows | |
| #6 | Doors and windows | |
| #7 | Wing fittings | |
| #8 | Tools for connecting or disengaging |
| # | Name | Total Patents |
|---|---|---|
| #1 | Howard Frank E | 10 |
| #2 | Howard Charles P | 6 |
| #3 | Brinckerhoff Frank M | 1 |
| #4 | Bernard Doyle Joseph | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1901648A | Door hanger | |
| US1827143A | Doorcheck | |
| US1390786A | Door-holder | |
| US1326450A | Hollow door and fittings therefor. | |
| US1139869A | Door-catch. | |
| US1301790A | Manufacture of hollow metallic doors. | |
| US1229709A | Lock mechanism for sliding doors. | |
| US1099301A | Door-lock. | |
| US1139868A | Baggage-rack. | |
| US1301789A | Lock mechanism for sliding doors. | |
| US907601A | Baggage-rack. | |
| US945540A | Door-latch. | |
| US776397A | Operating device for double doors. |