Longyear™, Inc.
19Patents
1Active
19Granted
31Portfolio score
Filing activity: Mar 8, 1974 → Apr 27, 2010 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4823890A | Reverse circulation bit apparatus | Emerging Cross-Sectional Technologies | 165 | Expired |
| US4281722A | Retractable bit system | Fixed Constructions | 76 | Expired |
| US4834198A | Positive latch wire line core barrel apparatus | Fixed Constructions | 54 | Expired |
| US5267620A | Drilling latch apparatus | Fixed Constructions | 53 | Expired |
| US4800969A | Fast descent core barrel apparatus | Fixed Constructions | 50 | Expired |
| US5325930A | Overcenter toggle latch apparatus | Fixed Constructions | 46 | Expired |
| US3930679A | Dry hole wire core barrel apparatus | Fixed Constructions | 19 | Expired |
| US4266444A | High-low speed rotary drive mechanism | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4281725A | Knuckle joint spearhead core drilling apparatus | Fixed Constructions | 14 | Expired |
| US5040438A | Powered wrench apparatus | Fixed Constructions | 10 | Expired |
| US4375212A | Concrete sawing machine propulsion control apparatus | Performing Operations; Transporting | 9 | Expired |
| US3952817A | Basket type core retainer | Fixed Constructions | 8 | Expired |
| US4309922A | Rod break-out and make-up tool | Fixed Constructions | 7 | Expired |
| US5183366A | Rod handler apparatus | Fixed Constructions | 7 | Expired |
| US5404959A | Drill rig safety shutdown device | Mechanical Engineering; Lighting; Heating | 5 | Expired |
| US4297771A | Pivoting foot clamp and mounting frame | Fixed Constructions | 2 | Expired |
| US5105687A | Built-in rack apparatus | Emerging Cross-Sectional Technologies | 2 | Expired |
| US5031708A | Cockable corebreaker apparatus | Fixed Constructions | 1 | Expired |
| US8347984B2 | Variable force/variable frequency sonic drill head | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.