| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Measurement | |
| #3 | Machines | |
| #4 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Measuring length, angles and areas | |
| #4 | Pumps | |
| #5 | Testing of structures | |
| #6 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Fredd John V | 5 |
| #2 | Hoffer Temple P | 3 |
| #3 | Miller Ira A | 2 |
| #4 | Schramm Harry B | 1 |
| #5 | Kelly Warner M | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2777746A | Amplifying recorder for tubing calipers | |
| US2789357A | Dual drive tubing caliper | |
| US2695458A | Hydraulically operated feeler head for tubing calipers | |
| US2708316A | Tubing caliper | |
| US2637117A | Tubing calipering device | |
| US2596924A | Tubing caliper with latch means | |
| US2552901A | Method of controlling wells | |
| US2668500A | Two-zone pump | |
| US2563119A | Recorder chart for oil or gas well recording instruments | |
| US2522825A | Two-zone pump | |
| US2513869A | Two-zone pump | |
| US2515377A | Cutting device |