| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Civil engineering | |
| #3 | Packaging and shipping | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Elevators and escalators | |
| #3 | Wing fittings | |
| #4 | Unspecified technologies | |
| #5 | Fire-fighting | |
| #6 | Springs | |
| #7 | Bolts for doors or windows |
| # | Name | Total Patents |
|---|---|---|
| #1 | Norton Lewis C | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US1358977A | Door-controlling device | |
| US1385389A | Door-controlling device | |
| US1275980A | Door stop and holder. | |
| US1211337A | Door-check. | |
| US1152339A | Door-check. | |
| US1138306A | Door-operating device. | |
| US1124941A | Door closer and check. | |
| US1117694A | Door operating and locking mechanism. | |
| US1129046A | Door operating and locking device. | |
| US1124940A | Door-operating mechanism. | |
| US1132027A | Device for operating doors. | |
| US1071172A | Combined door-stop and door-holder. | |
| US1163104A | Device for operating elevator-doors. |