Patent Explorer
Browse, filter, and analyze 4 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US3756700A | Method and apparatus for increasing optical density ratios of light valves | Research Frontiers Inc | Expired / Lapsed | 1972-02-09 | 1973-09-04 | 1992-02-09 | 0.0 yrs | 20 | |
| US3742600A | Method for maintaining the separation of plates | Research Frontiers Inc | Expired / Lapsed | 1971-07-26 | 1973-07-03 | 1991-07-26 | 0.0 yrs | 12 | |
| US3708219A | Light valve with flowing fluid suspension | Research Frontiers Inc | Expired / Lapsed | 1971-08-24 | 1973-01-02 | 1991-08-24 | 0.0 yrs | 30 | |
| US3655267A | Light valves with high frequency excitation | Research Frontiers Inc | Expired / Lapsed | 1970-04-01 | 1972-04-11 | 1990-04-01 | 0.0 yrs | 5 |