| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 17 | |
| #2 | Switzerland | 1 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Transport | |
| #3 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Clutches and brakes | |
| #2 | Shafts | |
| #3 | Gearing | |
| #4 | Bolts for doors or windows | |
| #5 | Pipes | |
| #6 | Marine propulsion |
| # | Name | Total Patents |
|---|---|---|
| #1 | Isfort Fritz | 7 |
| #2 | Fritz Isfort | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB189544A | Improvements in or relating to friction clutches | |
| DE364104C | ball-bearing |