DE2540680C3 - Kopfhörer - Google Patents
KopfhörerInfo
- Publication number
- DE2540680C3 DE2540680C3 DE2540680A DE2540680A DE2540680C3 DE 2540680 C3 DE2540680 C3 DE 2540680C3 DE 2540680 A DE2540680 A DE 2540680A DE 2540680 A DE2540680 A DE 2540680A DE 2540680 C3 DE2540680 C3 DE 2540680C3
- Authority
- DE
- Germany
- Prior art keywords
- passive
- membrane
- membranes
- acoustic
- coupling space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012528 membrane Substances 0.000 claims description 262
- 230000008878 coupling Effects 0.000 claims description 81
- 238000010168 coupling process Methods 0.000 claims description 81
- 238000005859 coupling reaction Methods 0.000 claims description 81
- 230000004044 response Effects 0.000 claims description 28
- 230000000694 effects Effects 0.000 claims description 23
- 238000013016 damping Methods 0.000 claims description 20
- 239000011324 bead Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 6
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000004049 embossing Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 8
- 210000003128 head Anatomy 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004807 localization Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000000284 resting effect Effects 0.000 description 3
- 206010038743 Restlessness Diseases 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 210000000613 ear canal Anatomy 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 240000006108 Allium ampeloprasum Species 0.000 description 1
- 235000005254 Allium ampeloprasum Nutrition 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
- H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Headphones And Earphones (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT745474A AT330868B (de) | 1974-09-16 | 1974-09-16 | Kopfhorer |
| AT926174A AT338898B (de) | 1974-11-19 | 1974-11-19 | Kopfhorer |
| AT959374A AT338899B (de) | 1974-11-29 | 1974-11-29 | Kopfhorer |
| AT317075A AT338900B (de) | 1975-04-24 | 1975-04-24 | Kopfhorer |
| AT338075A AT334991B (de) | 1975-05-02 | 1975-05-02 | Kopfhorer |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2540680A1 DE2540680A1 (de) | 1976-03-25 |
| DE2540680B2 DE2540680B2 (de) | 1979-05-31 |
| DE2540680C3 true DE2540680C3 (de) | 1980-02-07 |
Family
ID=27506365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2540680A Expired DE2540680C3 (de) | 1974-09-16 | 1975-09-12 | Kopfhörer |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4005278A (OSRAM) |
| JP (1) | JPS5223259B2 (OSRAM) |
| CA (1) | CA1032479A (OSRAM) |
| CH (1) | CH600725A5 (OSRAM) |
| DE (1) | DE2540680C3 (OSRAM) |
| DK (1) | DK409175A (OSRAM) |
| FR (1) | FR2285041A1 (OSRAM) |
| GB (1) | GB1483829A (OSRAM) |
| IT (1) | IT1044053B (OSRAM) |
| NL (1) | NL7510751A (OSRAM) |
| SE (1) | SE398034B (OSRAM) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9401089U1 (de) * | 1994-01-23 | 1995-05-24 | König, Florian, Dipl.-Ing., 82110 Germering | Kleinkopfhörer mit Vorneortung von Hörereignissen |
Families Citing this family (89)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52105416U (OSRAM) * | 1976-02-06 | 1977-08-11 | ||
| AT348051B (de) * | 1977-04-15 | 1979-01-25 | Akg Akustische Kino Geraete | Kopfhoerer in geschlossener bauweise |
| DE2836937B2 (de) * | 1977-08-31 | 1981-06-25 | AKG Akustische u. Kino-Geräte GmbH, Wien | Kopfhörer |
| US4185175A (en) * | 1977-10-26 | 1980-01-22 | Michael Colombo | Cushioned extension for telephone earpiece |
| AT361555B (de) * | 1979-02-12 | 1981-03-25 | Akg Akustische Kino Geraete | Kopfhoerer |
| US4328400A (en) * | 1979-06-30 | 1982-05-04 | Pioneer Electronic Corporation | Coaxial multi-way planar diaphragm type loudspeaker system |
| AT362433B (de) * | 1979-08-23 | 1981-05-25 | Akg Akustische Kino Geraete | Orthodynamischer kopfhoerer |
| JPS57130682U (OSRAM) * | 1981-02-12 | 1982-08-14 | ||
| US4418248A (en) * | 1981-12-11 | 1983-11-29 | Koss Corporation | Dual element headphone |
| US4554414A (en) * | 1983-04-28 | 1985-11-19 | Harman International Industries Incorporated | Multi-driver loudspeaker |
| JPH0733508Y2 (ja) * | 1984-10-31 | 1995-07-31 | ソニー株式会社 | イヤホン |
| DE3530869A1 (de) * | 1985-08-29 | 1987-03-12 | Sennheiser Electronic | Membran fuer einen elektroakustischen wiedergabewandler |
| AT383930B (de) * | 1985-11-18 | 1987-09-10 | Akg Akustische Kino Geraete | Ohrpolster fuer kopfhoerer |
| US4899390A (en) * | 1986-09-19 | 1990-02-06 | Matsushita Electric Industrial Co., Ltd. | Thin speaker having an enclosure within an open portion and a closed portion |
| US4977975A (en) * | 1989-09-14 | 1990-12-18 | Lazzeroni John J | Vented motorcycle helmet speaker enclosure |
| JPH0394828U (OSRAM) * | 1990-01-17 | 1991-09-27 | ||
| US5136639A (en) * | 1990-04-11 | 1992-08-04 | Brito Ronald L | Telephone handset cushion |
| US5272757A (en) * | 1990-09-12 | 1993-12-21 | Sonics Associates, Inc. | Multi-dimensional reproduction system |
| JP3154214B2 (ja) * | 1992-09-25 | 2001-04-09 | ソニー株式会社 | ヘッドホン |
| US7088830B2 (en) * | 1997-04-30 | 2006-08-08 | American Technology Corporation | Parametric ring emitter |
| US6359990B1 (en) * | 1997-04-30 | 2002-03-19 | American Technology Corporation | Parametric ring emitter |
| US6038330A (en) * | 1998-02-20 | 2000-03-14 | Meucci, Jr.; Robert James | Virtual sound headset and method for simulating spatial sound |
| US6134336A (en) * | 1998-05-14 | 2000-10-17 | Motorola, Inc. | Integrated speaker assembly of a portable electronic device |
| US6850623B1 (en) | 1999-10-29 | 2005-02-01 | American Technology Corporation | Parametric loudspeaker with improved phase characteristics |
| CN1154394C (zh) * | 1999-01-26 | 2004-06-16 | 皇家菲利浦电子有限公司 | 具有一个容纳声音传感器和带有孔道的外壳的装置 |
| US6084976A (en) * | 1999-06-11 | 2000-07-04 | Lin; Chung-Yu | Earphone without impulse noise and conductive hearing loss |
| US20050195985A1 (en) * | 1999-10-29 | 2005-09-08 | American Technology Corporation | Focused parametric array |
| US20080165981A1 (en) * | 2000-07-25 | 2008-07-10 | Michael Jon Wurtz | Active-noise-reduction headsets with front-cavity venting |
| US7317802B2 (en) * | 2000-07-25 | 2008-01-08 | Lightspeed Aviation, Inc. | Active-noise-reduction headsets with front-cavity venting |
| US6856690B1 (en) * | 2002-01-09 | 2005-02-15 | Plantronis, Inc. | Comfortable earphone cushions |
| WO2003093950A2 (en) * | 2002-05-06 | 2003-11-13 | David Goldberg | Localized audio networks and associated digital accessories |
| AU2003295673A1 (en) * | 2002-11-15 | 2004-06-15 | American Technology Corp. (Atc) | A high intensity directional electroacoustic sound generating system for communications targeting |
| US6785395B1 (en) | 2003-06-02 | 2004-08-31 | Motorola, Inc. | Speaker configuration for a portable electronic device |
| JP2007517420A (ja) * | 2003-06-09 | 2007-06-28 | アメリカン・テクノロジー・コーポレーション | 顧客の待ち列に沿って視聴覚コンテンツを配信するシステムおよび方法 |
| US7300406B2 (en) * | 2003-09-30 | 2007-11-27 | Carter Vandette B | Medical examination apparatus |
| WO2005043771A1 (en) * | 2003-10-23 | 2005-05-12 | American Technology Corporation | Method of adusting linear parameters of a parametric ultrasonic signal to reduce non-linearities in decoupled audio output waves and system including same |
| US6995659B2 (en) | 2003-10-31 | 2006-02-07 | Nokia Corporation | Sound generating transducer |
| EP1790192A4 (en) | 2004-09-09 | 2010-06-02 | Godehard A Guenther | SPEAKERS AND SYSTEMS |
| US7391878B2 (en) * | 2005-01-12 | 2008-06-24 | Sheng-Hsin Liao | Earphone device having composite functions |
| DE102005005759A1 (de) * | 2005-02-07 | 2006-08-17 | Ultrasone Ag | Raumklang-Kopfhörer mit Hörhöchstfrequenzanhebung |
| US7436973B2 (en) * | 2005-05-12 | 2008-10-14 | Sheng-Hsin Liao | Structure for earphones with multiple sound tracks |
| EP1732351A1 (en) * | 2005-06-09 | 2006-12-13 | TCL Thomson Electronics Europe SAS | Acoustic enclosure and corresponding device |
| US8045727B2 (en) | 2005-09-30 | 2011-10-25 | Atmel Corporation | Headset power management |
| US7945297B2 (en) | 2005-09-30 | 2011-05-17 | Atmel Corporation | Headsets and headset power management |
| JP5265373B2 (ja) | 2005-11-11 | 2013-08-14 | フィテック システムズ リミテッド | ノイズ消去イヤホン |
| WO2007089845A2 (en) * | 2006-01-30 | 2007-08-09 | Etymotic Research, Inc. | Insert earphone using a moving coil driver |
| US7714838B2 (en) * | 2006-04-27 | 2010-05-11 | Research In Motion Limited | Handheld electronic device having hidden sound openings offset from an audio source |
| TW200803584A (en) * | 2006-06-29 | 2008-01-01 | Cotron Corp | In-ear type earphone with adjustable area of sound hole on housing behind speaker |
| US8275137B1 (en) | 2007-03-22 | 2012-09-25 | Parametric Sound Corporation | Audio distortion correction for a parametric reproduction system |
| TWM333022U (en) * | 2007-05-08 | 2008-05-21 | Hsin-Yuan Kuo | Surrounding-audio earphone |
| US8189840B2 (en) | 2007-05-23 | 2012-05-29 | Soundmatters International, Inc. | Loudspeaker and electronic devices incorporating same |
| US8666085B2 (en) * | 2007-10-02 | 2014-03-04 | Phitek Systems Limited | Component for noise reducing earphone |
| KR100968406B1 (ko) * | 2008-02-20 | 2010-07-07 | 크레신 주식회사 | 웨이브가이더가 장착된 헤드폰 |
| US20090296971A1 (en) * | 2008-05-29 | 2009-12-03 | Siemens Hearing Instruments, Inc. | Hearing Instrument Receiver With Improved Low-Frequency Efficiency |
| EP2129114A3 (en) * | 2008-05-29 | 2011-11-02 | Phitek Systems Limited | Media enhancement module |
| US20110002474A1 (en) * | 2009-01-29 | 2011-01-06 | Graeme Colin Fuller | Active Noise Reduction System Control |
| EP2226902A3 (en) * | 2009-03-06 | 2013-03-13 | Phitek Systems Limited | In-flight entertainment system connector |
| US20110075331A1 (en) * | 2009-05-04 | 2011-03-31 | Nigel Greig | Media Player Holder |
| JP2012527147A (ja) * | 2009-05-11 | 2012-11-01 | ティーピー ビジョン ホールディング ビー ヴィ | スピーカドライバとスピーカ装置 |
| US20110188668A1 (en) * | 2009-09-23 | 2011-08-04 | Mark Donaldson | Media delivery system |
| US9818394B2 (en) | 2009-11-30 | 2017-11-14 | Graeme Colin Fuller | Realisation of controller transfer function for active noise cancellation |
| US8755553B2 (en) * | 2009-12-24 | 2014-06-17 | Nokia Corporation | Apparatus |
| WO2011146429A1 (en) | 2010-05-17 | 2011-11-24 | Thales Avionics, Inc. | Airline passenger seat modular user interface device |
| EP2471710A1 (en) | 2010-11-15 | 2012-07-04 | Nigel Greig | Media distribution system |
| US8494188B2 (en) * | 2011-01-03 | 2013-07-23 | Abatech Electronics Co., Ltd. | Piezoelectric ceramic loudspeaker headphone structure |
| US9654854B2 (en) | 2011-06-01 | 2017-05-16 | Paul Darlington | In-ear device incorporating active noise reduction |
| KR101802239B1 (ko) * | 2011-06-14 | 2017-11-29 | 삼성전자주식회사 | 스피커 장치 |
| US8737665B2 (en) * | 2012-03-30 | 2014-05-27 | Eastern Technologies Holding Limited | Negative pressure earphone |
| CN102761801B (zh) * | 2012-04-28 | 2015-03-11 | 李世煌 | 模块型音箱构件 |
| SE537957C2 (sv) * | 2012-06-21 | 2015-12-08 | Hellberg Safety Ab | Hörselskydd |
| TWI551152B (zh) * | 2013-05-08 | 2016-09-21 | 寶德科技股份有限公司 | 具有被動音膜的耳機 |
| WO2014186383A1 (en) * | 2013-05-13 | 2014-11-20 | Dr. G Licensing, Llc | Portable loudspeakers and convertible personal audio headphone/loudspeakers |
| CN104185103A (zh) * | 2013-05-21 | 2014-12-03 | 宝德科技股份有限公司 | 耳机 |
| DE102013223979A1 (de) * | 2013-11-25 | 2015-06-11 | Robert Bosch Gmbh | Elektroaktive Schallwandlerfolie mit strukturierter Oberfläche |
| US9686604B2 (en) * | 2014-05-27 | 2017-06-20 | Voyetra Turtle Beach, Inc. | Hybrid ring-radiator headphone driver |
| DE102014221583B4 (de) * | 2014-10-23 | 2020-11-12 | Sennheiser Electronic Gmbh & Co. Kg | Elektroakustischer Schallwandler und Hörer |
| CN204425608U (zh) * | 2015-02-02 | 2015-06-24 | 瑞声光电科技(常州)有限公司 | 扬声器箱 |
| WO2016127119A1 (en) * | 2015-02-06 | 2016-08-11 | Clean Energy Labs, Llc | Loudspeaker having electrically conductive membrane transducers |
| WO2016181531A1 (ja) * | 2015-05-13 | 2016-11-17 | Omotenasy合同会社 | ヘッドフォン |
| USD777710S1 (en) * | 2015-07-22 | 2017-01-31 | Doppler Labs, Inc. | Ear piece |
| US9674596B2 (en) * | 2015-11-03 | 2017-06-06 | International Business Machines Corporation | Headphone with selectable ambient sound admission |
| CN107018459B (zh) * | 2016-01-27 | 2019-09-20 | 信泰光学(深圳)有限公司 | 耳机 |
| CN107018458B (zh) * | 2016-01-27 | 2020-02-21 | 信泰光学(深圳)有限公司 | 耳机 |
| TWM524028U (zh) * | 2016-03-25 | 2016-06-11 | Jetvox Acoustic Corp | 具有集流管之耳機裝置 |
| US9949030B2 (en) * | 2016-06-06 | 2018-04-17 | Bose Corporation | Acoustic device |
| US20190215593A1 (en) * | 2018-01-11 | 2019-07-11 | Te-Sheng LIU | Highly-Closed Headphone Apparatus with Wearing Comfort |
| US10623847B2 (en) * | 2018-08-02 | 2020-04-14 | EVA Automation, Inc. | Headphone with multiple acoustic paths |
| CN111083607B (zh) * | 2019-12-30 | 2025-02-21 | 歌尔科技有限公司 | 一种声学装置及电子设备 |
| US11805348B2 (en) | 2022-02-28 | 2023-10-31 | Zachary Arthur Mehrbach | Acoustical damping system for headphones |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2119911B2 (de) * | 1971-04-23 | 1973-11-15 | Siemens Ag, 1000 Berlin U. 8000 Muenchen | Elektroakustischer Wandler, insbe sondere Mikrofon fur Fernsprechanlagen |
| DE1259949B (de) * | 1964-07-29 | 1968-02-01 | Siemens Ag | Elektroakustischer Wandler mit beiderseits einer Schwingmembran liegenden akustisch wirksamen Raeumen |
| NL7001438A (OSRAM) * | 1969-02-17 | 1970-08-19 |
-
1975
- 1975-08-14 CA CA233,445A patent/CA1032479A/en not_active Expired
- 1975-09-11 GB GB37500/75A patent/GB1483829A/en not_active Expired
- 1975-09-11 FR FR7527936A patent/FR2285041A1/fr active Granted
- 1975-09-12 NL NL7510751A patent/NL7510751A/xx not_active Application Discontinuation
- 1975-09-12 IT IT27231/75A patent/IT1044053B/it active
- 1975-09-12 CH CH1185875A patent/CH600725A5/xx not_active IP Right Cessation
- 1975-09-12 JP JP50110144A patent/JPS5223259B2/ja not_active Expired
- 1975-09-12 SE SE7510191A patent/SE398034B/xx unknown
- 1975-09-12 DE DE2540680A patent/DE2540680C3/de not_active Expired
- 1975-09-12 DK DK409175A patent/DK409175A/da not_active Application Discontinuation
- 1975-09-15 US US05/613,578 patent/US4005278A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9401089U1 (de) * | 1994-01-23 | 1995-05-24 | König, Florian, Dipl.-Ing., 82110 Germering | Kleinkopfhörer mit Vorneortung von Hörereignissen |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2285041A1 (fr) | 1976-04-09 |
| IT1044053B (it) | 1980-03-20 |
| SE7510191L (sv) | 1976-03-17 |
| NL7510751A (nl) | 1976-03-18 |
| DE2540680B2 (de) | 1979-05-31 |
| AU8453375A (en) | 1977-03-10 |
| DK409175A (da) | 1976-03-17 |
| DE2540680A1 (de) | 1976-03-25 |
| CA1032479A (en) | 1978-06-06 |
| JPS5154423A (OSRAM) | 1976-05-13 |
| CH600725A5 (OSRAM) | 1978-06-30 |
| JPS5223259B2 (OSRAM) | 1977-06-23 |
| GB1483829A (en) | 1977-08-24 |
| US4005278A (en) | 1977-01-25 |
| FR2285041B1 (OSRAM) | 1982-04-02 |
| SE398034B (sv) | 1977-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| 8339 | Ceased/non-payment of the annual fee |