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Browse, filter, and analyze 1 patents across global jurisdictions.

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Patent Number Title Assignee Status Filing Date Grant Date Expires Remaining Claims Actions
US1977974A Apparatus for the directional transmission or reception of wave energy ELAC Electroacustic GmbH Expired / Lapsed 1931-06-13 1934-10-23 1951-06-13 0.0 yrs 0