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EP0346874
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EP About this file: EP0346874
| EP0346874 - Telephone circuit using DC blocked transformer and negative impedance technique [Right-click to bookmark this link] | Status | The application has been refused Status updated on 27.10.1994 Database last updated on 24.03.2026 | Most recent event Tooltip | 27.10.1994 | Refusal of application | published on 14.12.1994 [1994/50] | Applicant(s) | For all designated states SIEMENS AKTIENGESELLSCHAFT Werner-von-Siemens-Str. 1 DE-80333 München / DE | [N/P] |
| Former [1989/51] | For all designated states SIEMENS AKTIENGESELLSCHAFT Wittelsbacherplatz 2 D-80333 München / DE | Inventor(s) | 01 /
Gartner, Todd Henry 312 W. Glen Eagles Drive Phoenix Arizona 85023 / US | [1989/51] | Application number, filing date | 89110810.2 | 14.06.1989 | [1989/51] | Priority number, date | US19880207607 | 15.06.1988 Original published format: US 207607 | [1989/51] | Filing language | EN | Procedural language | EN | Publication | Type: | A2 Application without search report | No.: | EP0346874 | Date: | 20.12.1989 | Language: | EN | [1989/51] | Type: | A3 Search report | No.: | EP0346874 | Date: | 18.09.1991 | Language: | EN | [1991/38] | Search report(s) | (Supplementary) European search report - dispatched on: | EP | 01.08.1991 | Classification | IPC: | H04M19/00 | [1989/51] | CPC: |
H04M19/001 (EP,US);
H04M19/005 (EP,US)
| Designated contracting states | AT, BE, CH, DE, ES, FR, GB, GR, IT, LI, NL, SE [1989/51] | Title | German: | Telefonschaltung mit für Gleichstrom gesperrtem Übertrager und negativer Impedanztechnik | [1989/51] | English: | Telephone circuit using DC blocked transformer and negative impedance technique | [1989/51] | French: | Circuit téléphonique utilisant un transformateur bloqué pour le courant continu et utilisant la technique d'impédance négative | [1989/51] | File destroyed: | 15.01.2000 | Examination procedure | 05.12.1990 | Examination requested [1991/05] | 02.12.1993 | Despatch of a communication from the examining division (Time limit: M07) | 29.06.1994 | Reply to a communication from the examining division | 20.07.1994 | Despatch of communication that the application is refused, reason: substantive examination [1994/50] | 30.07.1994 | Application refused, date of legal effect [1994/50] | Fees paid | Renewal fee | 20.12.1990 | Renewal fee patent year 03 | 25.06.1992 | Renewal fee patent year 04 | 18.06.1993 | Renewal fee patent year 05 | 20.06.1994 | Renewal fee patent year 06 |
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| Responsibility for the accuracy, completeness or quality of the data displayed under the link provided lies entirely with the Unified Patent Court. | Documents cited: | Search | [Y] BRITISH TELECOMMUNICATIONS ENGINEERING, vol. 4, no. 4, January 1986, pages 203-206, London, GB; J.R.W. AMES: "Subscriber line interfaces" [Y] |