| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | Switzerland | 3 | |
| #3 | United Kingdom | 2 | |
| #4 | Austria | 1 | |
| #5 | Denmark | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machine tools | |
| #3 | Machines | |
| #4 | Civil engineering | |
| #5 | Control | |
| #6 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Milling | |
| #3 | Accessories for machine tools | |
| #4 | Separation | |
| #5 | Turning | |
| #6 | Unspecified technologies | |
| #7 | Swimming pools | |
| #8 | Shafts | |
| #9 | Alarm systems | |
| #10 | Safes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hoffmann Georg | 13 |
| #2 | Georg Hoffmann | 1 |
| #3 | Marek Hans-Joachim | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE4019858A1 | Indicating correct position of parked vehicle - involves sign display when vehicle is correctly parked | |
| DE2704672A1 | Flotation filter for grinding and cutting oils - has much larger area within pressure to volume ratio | |
| US1036239A | Apparatus for preparing old and new molding-sand. | |
| GB190409226A | Continuous Burning Arc Lamp with Amalgam Electrodes. | |
| GB190312456A | Improvements in and connected with Targets and Practice Ranges for Artillery and Rifle Fire |