NO158117C - Fremgangsmaate og apparat for aktivering av et forsinkelses-tennelement, samt tennings-styre-system for eksplosiver. - Google Patents
Fremgangsmaate og apparat for aktivering av et forsinkelses-tennelement, samt tennings-styre-system for eksplosiver.Info
- Publication number
- NO158117C NO158117C NO790269A NO790269A NO158117C NO 158117 C NO158117 C NO 158117C NO 790269 A NO790269 A NO 790269A NO 790269 A NO790269 A NO 790269A NO 158117 C NO158117 C NO 158117C
- Authority
- NO
- Norway
- Prior art keywords
- explosives
- activating
- procedure
- management system
- tension element
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/13—Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
- H03K5/131—Digitally controlled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/12—Bridge initiators
- F42B3/121—Initiators with incorporated integrated circuit
- F42B3/122—Programmable electronic delay initiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/045—Arrangements for electric ignition
- F42D1/05—Electric circuits for blasting
- F42D1/055—Electric circuits for blasting specially adapted for firing multiple charges with a time delay
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/04—Details
- G01V1/06—Ignition devices
- G01V1/08—Ignition devices involving time-delay devices
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F1/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers
- G04F1/005—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers using electronic timing, e.g. counting means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Nonlinear Science (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Unknown Time Intervals (AREA)
- Electronic Switches (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Air Bags (AREA)
- Programmable Controllers (AREA)
- Control Of Voltage And Current In General (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Tents Or Canopies (AREA)
- Ceramic Products (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Electric Clocks (AREA)
- Pulse Circuits (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB405778 | 1978-02-01 |
Publications (3)
Publication Number | Publication Date |
---|---|
NO790269L NO790269L (no) | 1979-08-02 |
NO158117B NO158117B (no) | 1988-04-05 |
NO158117C true NO158117C (no) | 1988-07-13 |
Family
ID=9769918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO790269A NO158117C (no) | 1978-02-01 | 1979-01-26 | Fremgangsmaate og apparat for aktivering av et forsinkelses-tennelement, samt tennings-styre-system for eksplosiver. |
Country Status (21)
Country | Link |
---|---|
US (5) | US4324182A (fr) |
EP (1) | EP0003412A3 (fr) |
JP (1) | JPS54111744A (fr) |
AT (1) | AT382017B (fr) |
AU (1) | AU520215B2 (fr) |
BR (1) | BR7900607A (fr) |
CA (1) | CA1125361A (fr) |
DE (1) | DE2945122A1 (fr) |
ES (2) | ES477321A1 (fr) |
FI (1) | FI69524C (fr) |
FR (1) | FR2438387A1 (fr) |
GB (1) | GB2015791B (fr) |
IN (1) | IN150970B (fr) |
MX (1) | MX145874A (fr) |
NO (1) | NO158117C (fr) |
NZ (1) | NZ189495A (fr) |
PH (1) | PH16261A (fr) |
SE (2) | SE445161B (fr) |
ZA (1) | ZA79355B (fr) |
ZM (1) | ZM1879A1 (fr) |
ZW (1) | ZW2579A1 (fr) |
Families Citing this family (92)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU518851B2 (en) * | 1978-04-26 | 1981-10-22 | Aeci Limited | Explosives |
DE2940227C2 (de) * | 1979-10-04 | 1983-08-18 | Diehl GmbH & Co, 8500 Nürnberg | Elektrischer Geschoßzünder |
US4445435A (en) * | 1980-05-05 | 1984-05-01 | Atlas Powder Company | Electronic delay blasting circuit |
DE3021976C2 (de) * | 1980-06-12 | 1983-07-07 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Elektrische Zündschaltung |
JPS57142498A (en) * | 1981-02-27 | 1982-09-03 | Asahi Chemical Ind | Delayed electric fuse |
JPS57142496A (en) * | 1981-02-27 | 1982-09-03 | Asahi Chemical Ind | Electric fuse |
DE3139214A1 (de) * | 1981-10-02 | 1983-04-21 | Volker Hallwirth | Schaltung fuer zeitlich gesteuerte stromversorgung |
GB2123122A (en) * | 1982-01-08 | 1984-01-25 | Hunting Eng Ltd | Explosive devices |
US4577561A (en) * | 1982-04-19 | 1986-03-25 | Bei Electronics, Inc. | Digital time fuze method and apparatus |
ATE23635T1 (de) * | 1982-06-03 | 1986-11-15 | Ici Plc | Vorrichtung und verfahren zum initiieren von explosionen. |
NO167995C (no) * | 1982-07-02 | 1992-01-02 | Schlumberger Ltd | Fremgangsmaate og system for selektiv broenn-perforering ved hjelp av en enkelt ledning. |
US4487125A (en) * | 1982-08-05 | 1984-12-11 | Rca Corporation | Timing circuit |
DE3301251C1 (de) * | 1983-01-15 | 1988-06-16 | Honeywell Gmbh, 6050 Offenbach | Verfahren und Schaltungsanordnung zum Programmieren eines elektronischen Kurzzeitgebers |
CA1233896A (fr) * | 1983-04-11 | 1988-03-08 | Kenneth N. Jarrott | Amorce electronique a temporisation programmable |
AU3328084A (en) * | 1983-10-05 | 1985-04-18 | Johannesburg Construction Corp. Pty. Ltd. | Electrical sequential firing system |
US4625205A (en) * | 1983-12-08 | 1986-11-25 | Lear Siegler, Inc. | Remote control system transmitting a control pulse sequence through interlocked electromechanical relays |
EG19633A (en) * | 1983-12-22 | 1995-08-30 | Dynamit Nobel Ag | Process for chronologically staggered release of electronic explosive detonating device |
US4674047A (en) * | 1984-01-31 | 1987-06-16 | The Curators Of The University Of Missouri | Integrated detonator delay circuits and firing console |
GB2164730B (en) * | 1984-09-04 | 1988-03-16 | Ici Plc | Remotely controlled firing of ignition elements |
DE3516816C1 (de) * | 1985-05-10 | 1986-10-30 | Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn | Anzuendeinrichtung fuer Treibladungen oder Gasgeneratoren |
US4860653A (en) * | 1985-06-28 | 1989-08-29 | D. J. Moorhouse | Detonator actuator |
WO1987000264A1 (fr) * | 1985-06-28 | 1987-01-15 | Moorhouse, D., J. | Detonateur |
ES2018823B3 (es) * | 1986-04-10 | 1991-05-16 | Ici Australia Ltd | Metodo de voladura |
AU585701B2 (en) * | 1986-04-10 | 1989-06-22 | Ici Australia Limited | Blasting method |
MW1787A1 (en) * | 1986-04-10 | 1987-12-09 | Ici Australia Ltd | Blasting method |
ZW15187A1 (en) * | 1986-08-29 | 1989-03-22 | Ici Australia Operations | Detonator system |
AU595916B2 (en) * | 1986-08-29 | 1990-04-12 | Ici Australia Operations Proprietary Limited | Detonator system |
US4825765A (en) * | 1986-09-25 | 1989-05-02 | Nippon Oil And Fats Co., Ltd. | Delay circuit for electric blasting, detonating primer having delay circuit and system for electrically blasting detonating primers |
JPS63148100A (ja) * | 1986-12-10 | 1988-06-20 | 日本油脂株式会社 | 集中管理電磁誘導式電気発破装置 |
GB8718202D0 (en) * | 1987-07-31 | 1987-09-09 | Du Pont Canada | Blasting system |
US5214236A (en) * | 1988-09-12 | 1993-05-25 | Plessey South Africa Limited | Timing of a multi-shot blast |
US5117756A (en) * | 1989-02-03 | 1992-06-02 | Atlas Powder Company | Method and apparatus for a calibrated electronic timing circuit |
US5189246A (en) * | 1989-09-28 | 1993-02-23 | Csir | Timing apparatus |
US5157222A (en) * | 1989-10-10 | 1992-10-20 | Joanell Laboratories, Inc. | Pyrotechnic ignition apparatus and method |
US4986183A (en) * | 1989-10-24 | 1991-01-22 | Atlas Powder Company | Method and apparatus for calibration of electronic delay detonation circuits |
JPH0694996B2 (ja) * | 1989-11-24 | 1994-11-24 | 繁明 國友 | 花火点火装置 |
ZA922367B (en) * | 1991-04-01 | 1992-12-30 | Kevin Hunter Waldock | Electrical connector |
US5295438A (en) * | 1991-12-03 | 1994-03-22 | Plessey Tellumat South Africa Limited | Single initiate command system and method for a multi-shot blast |
US5339741A (en) * | 1992-01-07 | 1994-08-23 | The Walt Disney Company | Precision fireworks display system having a decreased environmental impact |
US5526750A (en) * | 1992-01-07 | 1996-06-18 | The Walt Disney Company | Fireworks projectile having combustible shell |
CA2110742C (fr) * | 1992-12-07 | 1999-09-14 | Michael John Camille Marsh | Appareillage de surface pour mise a feu d'explosifs |
US5367957A (en) * | 1993-03-31 | 1994-11-29 | Texas Instruments Incorporated | Tunable timing circuit and method for operating same and blasting detonator using same |
DE4330195C1 (de) * | 1993-09-07 | 1994-11-10 | Dynamit Nobel Ag | Sprengmomentzünder |
US5440990A (en) * | 1993-09-16 | 1995-08-15 | The Walt Disney Company | Electronic time fuze |
GB9423314D0 (en) * | 1994-11-18 | 1995-01-11 | Explosive Dev Ltd | Electrical distribution system |
US5587550A (en) * | 1995-03-23 | 1996-12-24 | Quantic Industries, Inc. | Internally timed, multi-output impulse cartridge |
US5739462A (en) * | 1995-06-27 | 1998-04-14 | The Walt Disney Company | Method and apparatus for creating pyrotechnic effects |
US5767437A (en) * | 1997-03-20 | 1998-06-16 | Rogers; Donald L. | Digital remote pyrotactic firing mechanism |
US5912428A (en) * | 1997-06-19 | 1999-06-15 | The Ensign-Bickford Company | Electronic circuitry for timing and delay circuits |
US5964815A (en) * | 1997-10-21 | 1999-10-12 | Trw Inc. | Occupant restraint system having serially connected devices, a method for providing the restraint system and a method for using the restraint system |
US20060086277A1 (en) * | 1998-03-30 | 2006-04-27 | George Bossarte | Precision pyrotechnic display system and method having increased safety and timing accuracy |
WO1999054676A2 (fr) * | 1998-03-30 | 1999-10-28 | Magicfire, Inc. | Systeme et procede de presentation pyrotechnique de precision a securite et precision de synchronisation accrues |
US6644202B1 (en) * | 1998-08-13 | 2003-11-11 | Expert Explosives (Proprietary) Limited | Blasting arrangement |
DE10053750A1 (de) * | 2000-10-30 | 2002-06-06 | Siemens Ag | Verfahren und Vorrichtung zur überlastungsfreien Ansteuerung eines Aktuators |
US6941869B2 (en) * | 2000-11-09 | 2005-09-13 | Orica Explosives Technology Pty Ltd | Sensor for monitoring electronic detonation circuits |
DE10139810B4 (de) * | 2000-11-09 | 2014-10-16 | Orica Explosives Technology Pty. Ltd. | Spannungssensor zur Überwachung elektronischer Zündkreise |
EP1405011A4 (fr) | 2001-06-06 | 2010-03-24 | Senex Explosives Inc | Systeme permettant l'amoreage de serie de detonateurs a retardement individuel |
US8091477B2 (en) * | 2001-11-27 | 2012-01-10 | Schlumberger Technology Corporation | Integrated detonators for use with explosive devices |
US7577756B2 (en) | 2003-07-15 | 2009-08-18 | Special Devices, Inc. | Dynamically-and continuously-variable rate, asynchronous data transfer |
US7870825B2 (en) * | 2003-07-15 | 2011-01-18 | Special Devices, Incorporated | Enhanced method, device, and system for identifying an unknown or unmarked slave device such as in an electronic blasting system |
US6988449B2 (en) * | 2003-07-15 | 2006-01-24 | Special Devices, Inc. | Dynamic baselining in current modulation-based communication |
US7086334B2 (en) * | 2003-07-15 | 2006-08-08 | Special Devices, Inc. | Staggered charging of slave devices such as in an electronic blasting system |
US7054131B1 (en) | 2003-07-15 | 2006-05-30 | Special Devices, Inc. | Pre-fire countdown in an electronic detonator and electronic blasting system |
US20050081321A1 (en) * | 2003-10-15 | 2005-04-21 | Milligan Michael A. | Hand-held cordless vacuum cleaner |
US6941870B2 (en) * | 2003-11-04 | 2005-09-13 | Advanced Initiation Systems, Inc. | Positional blasting system |
WO2006050542A1 (fr) * | 2004-11-05 | 2006-05-11 | Rudy Willy Philomena Spiessens | Detonateur electronique et son procede de fonctionnement |
US8079307B2 (en) | 2005-10-05 | 2011-12-20 | Mckinley Paul | Electric match assembly with isolated lift and burst function for a pyrotechnic device |
US7781919B2 (en) * | 2006-09-14 | 2010-08-24 | Lutron Electronics Co., Inc. | Method of controlling a load control module as part of a startup sequence |
US7741732B2 (en) * | 2006-09-14 | 2010-06-22 | Lutron Electronics Co., Inc. | Method of configuring a startup sequence of a load control system |
US8002026B2 (en) * | 2006-10-26 | 2011-08-23 | Alliant Techsystems Inc. | Methods and apparatuses for electronic time delay and systems including same |
US7789153B2 (en) * | 2006-10-26 | 2010-09-07 | Alliant Techsystems, Inc. | Methods and apparatuses for electronic time delay and systems including same |
US7896185B2 (en) * | 2007-03-06 | 2011-03-01 | Kw Plastics | Plastic container having gasketless seal |
US20080282925A1 (en) * | 2007-05-15 | 2008-11-20 | Orica Explosives Technology Pty Ltd | Electronic blasting with high accuracy |
DE102007055123B4 (de) * | 2007-11-19 | 2020-06-18 | Robert Bosch Gmbh | Steuergerät und Verfahren zur Ansteuerung von Personenschutzmitteln für ein Fahrzeug |
US8316252B2 (en) * | 2008-05-30 | 2012-11-20 | Advanced Micro Devices, Inc. | Distributed clock gating with centralized state machine control |
US8477049B2 (en) * | 2009-06-05 | 2013-07-02 | Apple Inc. | Efficiently embedding information onto a keyboard membrane |
US8397814B2 (en) | 2010-12-17 | 2013-03-19 | Halliburton Energy Serivces, Inc. | Perforating string with bending shock de-coupler |
WO2012148429A1 (fr) | 2011-04-29 | 2012-11-01 | Halliburton Energy Services, Inc. | Atténuation de charge de choc dans ensemble d'outil de perforation de fond de trou |
US8985200B2 (en) | 2010-12-17 | 2015-03-24 | Halliburton Energy Services, Inc. | Sensing shock during well perforating |
US8397800B2 (en) | 2010-12-17 | 2013-03-19 | Halliburton Energy Services, Inc. | Perforating string with longitudinal shock de-coupler |
US8393393B2 (en) | 2010-12-17 | 2013-03-12 | Halliburton Energy Services, Inc. | Coupler compliance tuning for mitigating shock produced by well perforating |
US20120241169A1 (en) | 2011-03-22 | 2012-09-27 | Halliburton Energy Services, Inc. | Well tool assemblies with quick connectors and shock mitigating capabilities |
US9091152B2 (en) | 2011-08-31 | 2015-07-28 | Halliburton Energy Services, Inc. | Perforating gun with internal shock mitigation |
US9297228B2 (en) | 2012-04-03 | 2016-03-29 | Halliburton Energy Services, Inc. | Shock attenuator for gun system |
GB201207450D0 (en) * | 2012-04-26 | 2012-06-13 | Secr Defence | An electrical pulse splitter for an explosives system |
US9598940B2 (en) | 2012-09-19 | 2017-03-21 | Halliburton Energy Services, Inc. | Perforation gun string energy propagation management system and methods |
US8978749B2 (en) | 2012-09-19 | 2015-03-17 | Halliburton Energy Services, Inc. | Perforation gun string energy propagation management with tuned mass damper |
ZA201306962B (en) * | 2012-09-21 | 2014-04-30 | George Plichta Martin | Delay arrangement |
WO2014084868A1 (fr) | 2012-12-01 | 2014-06-05 | Halliburton Energy Services, Inc. | Protection des dispositifs électroniques utilisés avec les perforateurs de tubage |
US10267613B2 (en) * | 2014-09-03 | 2019-04-23 | Detnet South Africa (Pty) Limited | Electronic detonator leakage current restriction |
EP3743591A4 (fr) | 2018-01-23 | 2022-03-23 | GeoDynamics, Inc. | Ensemble commutateur auquel il est possible de s'adresser pour systèmes et procédé de puits de forage |
DE102018128485B4 (de) * | 2018-11-14 | 2022-05-05 | Rheinmetall Waffe Munition Gmbh | Elektronische Zündereinheit für einen Irritationskörper und Irritationskörper |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2546686A (en) * | 1947-03-21 | 1951-03-27 | Du Pont | Blasting device |
US3067684A (en) * | 1960-07-27 | 1962-12-11 | Gen Electric | Trajectory sensitive time actuating systems |
US3312869A (en) * | 1964-05-12 | 1967-04-04 | Werner Peder | Detonator apparatus for series firing of explosives |
GB1067931A (en) * | 1964-05-12 | 1967-05-10 | Peder Werner | Electrical firing apparatus for sequentially firing a plurality of explosive charges |
ES345935A1 (es) * | 1966-11-12 | 1968-12-01 | Wasagchemie Ag | Una disposicion de circuito con tiristores y diodos de cua-tro capas para conmutadores de pasos. |
US3500746A (en) * | 1968-04-17 | 1970-03-17 | Lear Siegler Inc | Weapon system with an electronic time fuze |
US3646371A (en) * | 1969-07-25 | 1972-02-29 | Us Army | Integrated timer with nonvolatile memory |
US3603844A (en) * | 1969-07-31 | 1971-09-07 | Hercules Inc | Electronic delay multiperiod initiating system |
US3571605A (en) * | 1969-08-25 | 1971-03-23 | Us Air Force | Intervalometer for an illumination system |
DE2022356C3 (de) * | 1970-05-08 | 1980-06-04 | Honeywell Gmbh, 6000 Frankfurt | Verfahren und Schaltungsanordnung zum Programmieren eines elektronischen Kurzzeitgebers, insbesondere eines elektronischen Laufzeitzunders |
DE2046098C3 (de) * | 1970-09-18 | 1975-11-13 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Schaltungsanordnung zum Zünden der Zündkapseln eines Raketenstartgerätes |
US3739199A (en) * | 1971-12-16 | 1973-06-12 | Commissariat Energie Atomique | Generator of a time interval as a multiple of a base period |
US3851589A (en) * | 1973-04-25 | 1974-12-03 | Texaco Inc | Electronic delay blaster |
GB1493104A (en) * | 1973-05-19 | 1977-11-23 | Ferranti Ltd | Projectile fuses |
ZA746477B (en) * | 1973-11-14 | 1975-10-29 | Siemens Ag | Circuit arrangement for producing consecutive current impulses |
JPS5254362A (en) * | 1975-10-29 | 1977-05-02 | Mitsubishi Electric Corp | Timer |
CH621230B (fr) * | 1975-11-25 | Mefina Sa | Dispositif d'allumage electronique pour fusee de projectile. | |
ZA771838B (en) * | 1976-03-30 | 1978-03-29 | Tri Electronics Ab | An electric detonator cap |
IN163922B (fr) * | 1983-12-22 | 1988-12-10 | Dynamit Nobel Ag | |
DE8432097U1 (de) * | 1984-11-02 | 1986-07-17 | Dynamit Nobel Ag, 5210 Troisdorf | Elektronischer Sprengzeitzünder |
-
1979
- 1979-01-18 DE DE19792945122 patent/DE2945122A1/de active Granted
- 1979-01-18 EP EP79300087A patent/EP0003412A3/fr not_active Withdrawn
- 1979-01-18 GB GB7901794A patent/GB2015791B/en not_active Expired
- 1979-01-22 US US06/005,551 patent/US4324182A/en not_active Ceased
- 1979-01-26 NO NO790269A patent/NO158117C/no unknown
- 1979-01-26 PH PH22117A patent/PH16261A/en unknown
- 1979-01-26 ZA ZA79355A patent/ZA79355B/xx unknown
- 1979-01-29 IN IN062/DEL/79A patent/IN150970B/en unknown
- 1979-01-29 NZ NZ189495A patent/NZ189495A/xx unknown
- 1979-01-30 ZW ZW25/79A patent/ZW2579A1/xx unknown
- 1979-01-31 BR BR7900607A patent/BR7900607A/pt unknown
- 1979-01-31 ES ES477321A patent/ES477321A1/es not_active Expired
- 1979-01-31 MX MX176467A patent/MX145874A/es unknown
- 1979-01-31 AU AU43783/79A patent/AU520215B2/en not_active Expired
- 1979-02-01 JP JP974079A patent/JPS54111744A/ja active Granted
- 1979-02-01 AT AT0076679A patent/AT382017B/de not_active IP Right Cessation
- 1979-02-01 FI FI790332A patent/FI69524C/fi not_active IP Right Cessation
- 1979-02-01 CA CA320,662A patent/CA1125361A/fr not_active Expired
- 1979-02-28 ZM ZM18/79A patent/ZM1879A1/xx unknown
- 1979-04-03 ES ES479235A patent/ES479235A1/es not_active Expired
- 1979-11-08 FR FR7927769A patent/FR2438387A1/fr active Granted
-
1980
- 1980-02-06 SE SE8000946A patent/SE445161B/sv unknown
-
1981
- 1981-10-01 US US06/307,634 patent/US4409897A/en not_active Ceased
- 1981-10-01 US US06/307,633 patent/US4419933A/en not_active Expired - Lifetime
-
1988
- 1988-02-05 US US07/152,927 patent/USRE32888E/en not_active Expired - Lifetime
- 1988-10-25 US US07/261,888 patent/USRE33004E/en not_active Expired - Lifetime
-
1990
- 1990-10-12 SE SE9003267A patent/SE9003267L/ not_active Application Discontinuation
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