Sigma-Tek, LLC
6Patents
2Active
6Granted
33Portfolio score
Filing activity: Dec 31, 1981 → Aug 17, 2009 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5181844A | Rotary vane pump with carbon/carbon vanes | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US4820140A | Self-lubricating rotary vane pump | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| USD271976S | Piston vacuum pump | General | 19 | Expired |
| US8444900B2 | Method and system for forming composite geometric support structures | Emerging Cross-Sectional Technologies | 17 | Active |
| US8313600B2 | Method and system for forming composite geometric support structures | Physics | 12 | Active |
| US4469473A | Reciprocating piston apparatus | Mechanical Engineering; Lighting; Heating | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.