Patent Explorer
Browse, filter, and analyze 8 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US4789865A | Collision avoidance system | Litchstreet Co | Expired / Lapsed | 1987-10-21 | 1988-12-06 | 2007-10-21 | 0.0 yrs | 18 | |
| US4642648A | Simple passive/active proximity warning system | Litchstreet Co | Expired / Lapsed | 1984-03-14 | 1987-02-10 | 2004-03-14 | 0.0 yrs | 50 | |
| US4115771A | Passive ATCRBS using signals of remote SSR | Litchstreet Co | Expired / Lapsed | 1977-05-17 | 1978-09-19 | 1997-05-17 | 0.0 yrs | 12 | |
| US4027307A | Collision avoidance/proximity warning system using secondary radar | Litchstreet Co | Expired / Lapsed | 1975-05-09 | 1977-05-31 | 1995-05-09 | 0.0 yrs | 61 | |
| US4021802A | Collision avoidance system | Litchstreet Co | Expired / Lapsed | 1975-07-29 | 1977-05-03 | 1995-07-29 | 0.0 yrs | 25 | |
| US3959793A | Proximity indication with means for computing the distance from an own station to an interrogating secondary surveillance radar | Litchstreet Co | Expired / Lapsed | 1974-08-07 | 1976-05-25 | 1994-08-07 | 0.0 yrs | 24 | |
| US3921172A | Proximity indication with range and bearing measurements | Litchstreet Co | Expired / Lapsed | 1974-06-21 | 1975-11-18 | 1994-06-21 | 0.0 yrs | 8 | |
| US3858211A | Proximity indication with range and bearing measurements | Litchstreet Co | Expired / Lapsed | 1973-06-20 | 1974-12-31 | 1993-06-20 | 0.0 yrs | 8 |