Patent Explorer
Browse, filter, and analyze 8 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| GB1020404A | Improvements in or relating to telephone systems | Siemens and Halske AG | Expired / Lapsed | 1964-06-03 | — | 1984-06-03 | 0.0 yrs | 0 | |
| US3193739A | Semiconductor device having four-layer components for obtaining negative current-voltage characteristics | Siemens and Halske AG | Expired / Lapsed | 1962-05-15 | 1965-07-06 | 1982-05-15 | 0.0 yrs | 2 | |
| US2956126A | Start-stop teleprinter system | Siemens and Halske AG | Expired / Lapsed | 1957-05-22 | 1960-10-11 | 1977-05-22 | 0.0 yrs | 0 | |
| US2242366A | Apparatus for testing magnetizable workpieces for cracks | Siemens and Halske AG | Expired / Lapsed | 1937-10-20 | 1941-05-20 | 1957-10-20 | 0.0 yrs | 0 | |
| US2164595A | Method of coating electrodes | Siemens and Halske AG | Expired / Lapsed | 1937-11-13 | 1939-07-04 | 1957-11-13 | 0.0 yrs | 0 | |
| US2050866A | Apparatus for testing the running of timepieces | Siemens and Halske AG | Expired / Lapsed | 1934-02-19 | 1936-08-11 | 1954-02-19 | 0.0 yrs | 0 | |
| US1677378A | Device for indicating the quotient of two electrical quantities | Siemens and Halske AG | Expired / Lapsed | 1926-10-20 | 1928-07-17 | 1946-10-20 | 0.0 yrs | 0 | |
| US1123067A | Means for adjusting from a distance any desired objects. | Siemens and Halske AG | Expired / Lapsed | 1910-12-24 | 1914-12-29 | 1930-12-24 | 0.0 yrs | 0 |