| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | United States | 6 | |
| #3 | France | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Foundations and excavations | |
| #3 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kammerer Archer W Jr | 5 |
| #2 | William Kammerer Jun Archer | 5 |
| #3 | Johnson Gary R | 3 |
| #4 | Ralph Johnson Gary | 2 |
| #5 | Sampson Alan C | 1 |
| #6 | Kammerer Jr Archer W | 1 |
| #7 | Ailliam Kammerer Jun Archer | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3545553A | Retrievable well drilling apparatus | |
| US3545543A | Casing apparatus and method for tensioning casing strings | |
| US3570603A | Method and apparatus for cementing casing sections in well bores | |
| US3554305A | Reverse circulation expansible rotary drill bit with hydraulic lock | |
| US3503213A | Method of and apparatus for installing reinforcing members in boreholes | |
| US2758818A | Casing and drill pipe protectors |