Long Enterprises
7Patents
0Active
7Granted
25Portfolio score
Filing activity: May 5, 1975 → Aug 12, 1992
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5147563A | Sewage sludge treatment with gas injection | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4582612A | Sewage sludge treatment apparatus | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4695388A | Apparatus and process for rapid sewage sludge separation | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4659464A | Apparatus for dispersing sludge with gas impingement | Emerging Cross-Sectional Technologies | 10 | Expired |
| US3965298A | Deep sea diving speech converter | Physics | 7 | Expired |
| US5248419A | Sewage sludge treatment with gas injection | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4936983A | Sewage sludge treatment with gas injection | Emerging Cross-Sectional Technologies | 3 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.