David Stephenson
14Patents
6h-index
17Co-inventors
63Inventor score
Filing activity: May 10, 1982 → Nov 7, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8621241B1 | Storage and recovery of cryptographic key identifiers | Electricity | 228 | Active |
| US6840325B2 | Expandable connection for use with a swelling elastomer | Mechanical Engineering; Lighting; Heating | 63 | Expired |
| US7578043B2 | Coupling tubulars | Emerging Cross-Sectional Technologies | 34 | Active |
| US4511539A | Recovery of precious metal | Emerging Cross-Sectional Technologies | 21 | Expired |
| US7144243B2 | Tubing expansion | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5593726A | Hot isostatic pressing process for applying wear and corrosion resistant coatings | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US4469666A | Catalyst units for producing hydrocyanic acid | Chemistry; Metallurgy | 6 | Expired |
| US5681499A | Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom | Performing Operations; Transporting | 5 | Expired |
| US10934796B2 | Method for removing casing from a wellbore | Fixed Constructions | 0 | Active |
| US10907439B2 | Apparatus and method for well tubular flotation | Fixed Constructions | 0 | Active |
| US8892907B2 | Storage and recovery of cryptographic key identifiers | Electricity | 0 | Active |
| US12173574B2 | Method and apparatus for well tubular flotation | Fixed Constructions | 0 | Active |
| US8075813B2 | Tubing expansion | Emerging Cross-Sectional Technologies | 0 | Active |
| US11828119B2 | Method and apparatus for well tubular flotation | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.