US20020069781A1 - Recessed glass header for pyrotechnic initiators - Google Patents
Recessed glass header for pyrotechnic initiators Download PDFInfo
- Publication number
- US20020069781A1 US20020069781A1 US09/733,548 US73354800A US2002069781A1 US 20020069781 A1 US20020069781 A1 US 20020069781A1 US 73354800 A US73354800 A US 73354800A US 2002069781 A1 US2002069781 A1 US 2002069781A1
- Authority
- US
- United States
- Prior art keywords
- header
- center pin
- eyelet
- glass surface
- further including
- 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.)
- Abandoned
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Classifications
-
- 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
- F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
Definitions
- the present invention relates to the field of pyrotechnic initiators, and more particularly to a pyrotechnic initiator having a recessed glass header.
- Pyrotechnic initiators have many uses in industrial and consumer applications.
- One important use is the inflation of airbags in motor vehicles.
- a header for an initiator includes a recessed glass insulator.
- the recessed nature of the glass insulator enhances secure and effective disposition of an ignition pyrotechnic charge droplet to the header in the area of the bridgewire, and also reduces or eliminates the need for machining the header.
- FIGURE is a side sectional view of an embodiment of the present invention.
- a preferred embodiment of a header 10 consists primarily of a ground pin 30 , a central isolated pin 40 , a recessed glass 50 , an eyelet 60 , a bridgewire 70 , and an ignition pyrotechnic charge droplet 80 .
- the header 10 is generally like sealed-glass headers commonly used in airbag initiators, except that the glass 50 is recessed from the top surface of eyelet 60 as compared to conventional sealed-glass headers, wherein the glass is flush with the eyelet top surface.
- the glass insulator is recessed.
- the header can be fixtured upside-down, using a fixture that includes a carbon or other suitable projection (not shown) to displace glass 50 (but not pin 40 ) away from the top surface of eyelet 60 during heating and sealing.
- the header might be fixtured right-side-up, using a fixture that includes means positioned below glass 50 to support it at the appropriate height during heating and sealing. While steps can also be taken to ensure that the top surface of glass 50 is flat (as shown in the FIGURE), a meniscus (not shown) on the top surface of glass 50 is generally acceptable as long as glass 50 is sufficiently recessed.
- recessed glass 50 eliminates the need for grinding the top surface of the header, since bridgewire 70 can be welded to isolated pin 40 on one end and to eyelet 60 on the other end without concern for weld electrodes contacting the glass or other surfaces higher than the weld surface. Because the features needed for bridgewire welding are thus already present without the need for header surface grinding, eyelet 60 can be manufactured by methods, such as stamping or cold-forming, which are significantly cheaper than the machining operation used for most current eyelets.
- the ignition pyrotechnic droplet 80 can be more advantageously disposed and held around bridgewire 70 .
- the cavity promotes an enhanced degree of contact between droplet 80 and bridgewire 70 , and also helps secure droplet 80 against movement (such as during physical environmental testing).
- Droplet 80 can be dispensed as a liquid or slurry using formulas and techniques known to those of ordinary skill in the art. For example, a generally suitable formula and techniques are described in U.S. Pat. No. 5,939,660 to Fogle, Jr., which is incorporated herein by reference as if set forth in full.
- Droplet 80 can be dispensed with volumetric dispensing syringe-type equipment, or it can also be sprayed or placed after it is dispensed onto another part of the equipment. Retention of droplet 80 in its place (and thus maintenance of good contact with bridgewire 70 ) can be further enhanced by the provision of a circumferential notch 41 or other irregular surface near the top of isolated pin 40 .
- the header of the present invention can be pressed into a suitable can (not shown) that is loaded with a suitable output pyrotechnic charge (such as one provided using a conventional slurry loading process).
- the header can then be hermetically sealed (for example, with a through-weld) to the can to form an initiator sub-assembly, which can in turn be completed by, for example, a suitable method of insert-molding a nylon body to provide electrical insulation and structural support.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Air Bags (AREA)
- Joining Of Glass To Other Materials (AREA)
Abstract
Description
- The present invention relates to the field of pyrotechnic initiators, and more particularly to a pyrotechnic initiator having a recessed glass header.
- Pyrotechnic initiators have many uses in industrial and consumer applications. One important use is the inflation of airbags in motor vehicles. As airbag production has steadily increased, significant efforts have been made to reduce the cost of reliable airbag initiators. Nevertheless, there remains a substantial need in the automotive airbag industry in particular as well as in other applications, for further reduction in the costs of manufacturing reliable initiators.
- In accordance with the present invention, a header for an initiator is provided that includes a recessed glass insulator. The recessed nature of the glass insulator enhances secure and effective disposition of an ignition pyrotechnic charge droplet to the header in the area of the bridgewire, and also reduces or eliminates the need for machining the header.
- The FIGURE is a side sectional view of an embodiment of the present invention.
- As can be seen from the FIGURE, a preferred embodiment of a
header 10 according to the present invention consists primarily of aground pin 30, a central isolatedpin 40, arecessed glass 50, aneyelet 60, abridgewire 70, and an ignitionpyrotechnic charge droplet 80. Theheader 10 is generally like sealed-glass headers commonly used in airbag initiators, except that theglass 50 is recessed from the top surface ofeyelet 60 as compared to conventional sealed-glass headers, wherein the glass is flush with the eyelet top surface. There are a number of ways to attain a header according to the present invention wherein the glass insulator is recessed. For example, the header can be fixtured upside-down, using a fixture that includes a carbon or other suitable projection (not shown) to displace glass 50 (but not pin 40) away from the top surface ofeyelet 60 during heating and sealing. Alternately, the header might be fixtured right-side-up, using a fixture that includes means positioned belowglass 50 to support it at the appropriate height during heating and sealing. While steps can also be taken to ensure that the top surface ofglass 50 is flat (as shown in the FIGURE), a meniscus (not shown) on the top surface ofglass 50 is generally acceptable as long asglass 50 is sufficiently recessed. - The recessed nature of
recessed glass 50 eliminates the need for grinding the top surface of the header, since bridgewire 70 can be welded to isolatedpin 40 on one end and to eyelet 60 on the other end without concern for weld electrodes contacting the glass or other surfaces higher than the weld surface. Because the features needed for bridgewire welding are thus already present without the need for header surface grinding,eyelet 60 can be manufactured by methods, such as stamping or cold-forming, which are significantly cheaper than the machining operation used for most current eyelets. - Further, because the recessed upper surface of
recessed glass 50, the inner surface of the bore ofeyelet 60, andcenter pin 40 together form a cavity, the ignitionpyrotechnic droplet 80 can be more advantageously disposed and held aroundbridgewire 70. The cavity promotes an enhanced degree of contact betweendroplet 80 and bridgewire 70, and also helps securedroplet 80 against movement (such as during physical environmental testing). Droplet 80 can be dispensed as a liquid or slurry using formulas and techniques known to those of ordinary skill in the art. For example, a generally suitable formula and techniques are described in U.S. Pat. No. 5,939,660 to Fogle, Jr., which is incorporated herein by reference as if set forth in full. Droplet 80 can be dispensed with volumetric dispensing syringe-type equipment, or it can also be sprayed or placed after it is dispensed onto another part of the equipment. Retention ofdroplet 80 in its place (and thus maintenance of good contact with bridgewire 70) can be further enhanced by the provision of acircumferential notch 41 or other irregular surface near the top of isolatedpin 40. - As evident to one of ordinary skill in the art, the header of the present invention can be pressed into a suitable can (not shown) that is loaded with a suitable output pyrotechnic charge (such as one provided using a conventional slurry loading process). The header can then be hermetically sealed (for example, with a through-weld) to the can to form an initiator sub-assembly, which can in turn be completed by, for example, a suitable method of insert-molding a nylon body to provide electrical insulation and structural support.
- A preferred header with recessed glass insulator, and many of its attendant advantages, has thus been disclosed. It will be apparent, however, that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention, the form hereinbefore described being merely a preferred or exemplary embodiment thereof. Therefore, the invention is not to be restricted or limited except in accordance with the following claims and their legal equivalents.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/733,548 US20020069781A1 (en) | 2000-12-07 | 2000-12-07 | Recessed glass header for pyrotechnic initiators |
PCT/US2001/043592 WO2002046686A2 (en) | 2000-12-07 | 2001-11-21 | Recessed glass header for pyrotechnic initiators |
AU2002228622A AU2002228622A1 (en) | 2000-12-07 | 2001-11-21 | Recessed glass header for pyrotechnic initiators |
US10/298,107 US6612241B2 (en) | 2000-12-07 | 2002-11-14 | Pyrotechnic initiator with center pin having a circumferential notch retention feature |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/733,548 US20020069781A1 (en) | 2000-12-07 | 2000-12-07 | Recessed glass header for pyrotechnic initiators |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/298,107 Continuation-In-Part US6612241B2 (en) | 2000-12-07 | 2002-11-14 | Pyrotechnic initiator with center pin having a circumferential notch retention feature |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020069781A1 true US20020069781A1 (en) | 2002-06-13 |
Family
ID=24948073
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/733,548 Abandoned US20020069781A1 (en) | 2000-12-07 | 2000-12-07 | Recessed glass header for pyrotechnic initiators |
US10/298,107 Expired - Lifetime US6612241B2 (en) | 2000-12-07 | 2002-11-14 | Pyrotechnic initiator with center pin having a circumferential notch retention feature |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/298,107 Expired - Lifetime US6612241B2 (en) | 2000-12-07 | 2002-11-14 | Pyrotechnic initiator with center pin having a circumferential notch retention feature |
Country Status (3)
Country | Link |
---|---|
US (2) | US20020069781A1 (en) |
AU (1) | AU2002228622A1 (en) |
WO (1) | WO2002046686A2 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040000248A1 (en) * | 2002-07-01 | 2004-01-01 | Vahan Avetisian | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
EP1455160A1 (en) * | 2003-03-03 | 2004-09-08 | Schott Glas | Metal-fixing-material-passage and method of manufacturing a header with a metal-fixing-material-passage |
EP1808667A3 (en) * | 2003-03-03 | 2007-08-01 | Schott AG | Metal fusing material and method for manufacturing a carrier for a duct with metal fusing material |
DE102006004036A1 (en) * | 2006-01-27 | 2007-08-09 | Schott Ag | Metal fixing material implementation and use of such a passage and airbag and belt tensioner with an ignition device |
KR100760887B1 (en) * | 2003-03-03 | 2007-09-21 | 쇼오트 아게 | Metal fixing material bushing socket and method of manufacturing base body of the same |
US20080250963A1 (en) * | 2003-03-03 | 2008-10-16 | Schott Ag | Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing |
US20100064923A1 (en) * | 2006-11-28 | 2010-03-18 | Schott Ag | Firing apparatus for a pyrotechnic protection apparatus |
US20120186477A1 (en) * | 2010-04-09 | 2012-07-26 | Bae Systems Information And Electronic Systems Integration Inc. | Enhanced reliability miniature piston actuator for an electronic thermal battery initiator |
US8733250B2 (en) | 2006-01-27 | 2014-05-27 | Schott Ag | Metal-sealing material-feedthrough and utilization of the metal-sealing material feedthrough with an airbag, a belt tensioning device, and an ignition device |
DE102014219125A1 (en) * | 2014-09-23 | 2016-03-24 | Schott Ag | Feedthrough element with directly connected ground pin, process for its preparation and its use |
DE102014219127A1 (en) * | 2014-09-23 | 2016-03-24 | Schott Ag | Feedthrough element with welded ground pin, method for its production and its use |
US9423218B2 (en) | 2010-09-17 | 2016-08-23 | Schott Ag | Method for producing a ring-shaped or plate-like element |
DE102016008543B3 (en) * | 2016-07-11 | 2018-01-04 | Elisabeth Dürschinger | Basic body for a detonator for occupants - restraint systems |
US10684102B2 (en) | 2010-09-17 | 2020-06-16 | Schott Ag | Method for producing a ring-shaped or plate-like element |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4813642B2 (en) * | 2000-08-09 | 2011-11-09 | ダイセル化学工業株式会社 | Electric initiator and initiator assembly using the same |
US7287072B1 (en) * | 2000-10-17 | 2007-10-23 | Sprint Communications Company L.P. | Remote monitoring information management |
US20030192446A1 (en) * | 2002-04-16 | 2003-10-16 | Paul Berg | Header with overlying eyelet |
US20040244624A1 (en) * | 2003-01-31 | 2004-12-09 | Hiroshi Harada | Parts of igniter |
US20060208474A1 (en) * | 2003-12-24 | 2006-09-21 | Nippon Kayaku Kabushiki Kaisha | Gas producer |
US7515461B2 (en) * | 2007-01-05 | 2009-04-07 | Macronix International Co., Ltd. | Current compliant sensing architecture for multilevel phase change memory |
US7845277B2 (en) * | 2008-05-28 | 2010-12-07 | Autoliv Asp, Inc. | Header assembly |
DE102009008673B3 (en) | 2009-02-12 | 2010-08-19 | Schott Ag | Punched feedthrough element with soldered contact pin |
DE102012010608A1 (en) * | 2012-05-16 | 2013-11-21 | Trw Airbag Systems Gmbh | Lighter and method of making a lighter for a gas generator |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5711531A (en) * | 1993-10-20 | 1998-01-27 | Quantic Industries, Inc. | Electrical initiator seal |
US5939660A (en) * | 1997-03-12 | 1999-08-17 | Trw Inc. | Inflator for an inflatable vehicle occupant protection device |
US6305286B1 (en) * | 1997-03-12 | 2001-10-23 | Trw Inc. | Preparation of an igniter with an ultraviolet cured ignition droplet |
US5821446A (en) * | 1997-05-27 | 1998-10-13 | Trw Inc. | Inflator for an inflatable vehicle occupant protection device |
DE19733353C1 (en) * | 1997-08-01 | 1998-12-10 | Nico Pyrotechnik | Ignition unit for a personal protection device in a motor vehicle |
US6096997A (en) * | 1997-08-29 | 2000-08-01 | Trw Inc. | Method of assembling an igniter including infrared testing of heating element and welds |
US6272992B1 (en) * | 1999-03-24 | 2001-08-14 | Trw Inc. | Power spot ignition droplet |
US6230624B1 (en) * | 1999-08-13 | 2001-05-15 | Trw Inc. | Igniter having a hot melt ignition droplet |
US6357355B1 (en) * | 2000-02-10 | 2002-03-19 | Trw Inc. | Pyrotechnic igniter with radio frequency filter |
US20020069780A1 (en) * | 2000-12-07 | 2002-06-13 | Bos Laurence W. | Thin film resistor fabricated on header |
-
2000
- 2000-12-07 US US09/733,548 patent/US20020069781A1/en not_active Abandoned
-
2001
- 2001-11-21 AU AU2002228622A patent/AU2002228622A1/en not_active Abandoned
- 2001-11-21 WO PCT/US2001/043592 patent/WO2002046686A2/en not_active Application Discontinuation
-
2002
- 2002-11-14 US US10/298,107 patent/US6612241B2/en not_active Expired - Lifetime
Cited By (37)
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---|---|---|---|---|
US20040000248A1 (en) * | 2002-07-01 | 2004-01-01 | Vahan Avetisian | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
WO2004003456A1 (en) * | 2002-07-01 | 2004-01-08 | Special Devices, Incorporated | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
JP2015143611A (en) * | 2003-03-03 | 2015-08-06 | ショット アクチエンゲゼルシャフトSchott AG | Metal fixing bush, and method of manufacturing core of metal fixing bush |
KR100760887B1 (en) * | 2003-03-03 | 2007-09-21 | 쇼오트 아게 | Metal fixing material bushing socket and method of manufacturing base body of the same |
EP1808667A3 (en) * | 2003-03-03 | 2007-08-01 | Schott AG | Metal fusing material and method for manufacturing a carrier for a duct with metal fusing material |
US8276514B2 (en) * | 2003-03-03 | 2012-10-02 | Schott Ag | Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing |
EP1808667B1 (en) | 2003-03-03 | 2016-06-08 | Schott AG | Metal fusing material and method for manufacturing a carrier for a duct with metal fusing material |
US8327765B2 (en) * | 2003-03-03 | 2012-12-11 | Schott Ag | Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing |
CN100393555C (en) * | 2003-03-03 | 2008-06-11 | 肖特股份公司 | Metal-fixed material bushing and method of mfg. substrate of such bushing |
US20080250963A1 (en) * | 2003-03-03 | 2008-10-16 | Schott Ag | Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing |
EP1455160A1 (en) * | 2003-03-03 | 2004-09-08 | Schott Glas | Metal-fixing-material-passage and method of manufacturing a header with a metal-fixing-material-passage |
US20060222881A1 (en) * | 2003-03-03 | 2006-10-05 | Schott Ag | Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing |
US20100229616A1 (en) * | 2003-03-03 | 2010-09-16 | Schott Ag | Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing |
EP2251633A2 (en) * | 2003-03-03 | 2010-11-17 | Schott Ag | Metal-to-fixing-material-seal and method for manufacturing a base element with a metal-to-fixing-material-seal |
JP2013130388A (en) * | 2003-03-03 | 2013-07-04 | Schott Ag | Metal fixing material bushing and method of producing core material of metal fixing material bushing |
EP2251633A3 (en) * | 2003-03-03 | 2011-11-16 | Schott Ag | Metal-to-fixing-material-seal and method for manufacturing a base element with a metal-to-fixing-material-seal |
EP2187162A2 (en) | 2006-01-27 | 2010-05-19 | Schott AG | Glass-to-fixing-material bushing and use thereof as well as airbag and seat-belt tensioner with an initiatot |
EP2187162B1 (en) | 2006-01-27 | 2015-04-29 | Schott AG | Glass-to-fixing-material seal and use thereof as well as airbag and seat-belt tensioner with an initiator |
EP3104114A1 (en) | 2006-01-27 | 2016-12-14 | Schott Ag | Metal fusing material and method for manufacturing a carrier for a duct with metal fusing material |
DE102006004036A1 (en) * | 2006-01-27 | 2007-08-09 | Schott Ag | Metal fixing material implementation and use of such a passage and airbag and belt tensioner with an ignition device |
US8127681B2 (en) | 2006-01-27 | 2012-03-06 | Schott Ag | Metal-sealing material-feedthrough and utilization of the metal-sealing material feedthrough with an airbag, a belt tensioning device, and an ignition device |
EP2270417A2 (en) | 2006-01-27 | 2011-01-05 | Schott Ag | Glass-to-fixing-material seal and use thereof as well as airbag and seat-belt tensioner with an initiator |
US20070187934A1 (en) * | 2006-01-27 | 2007-08-16 | Thomas Fink | Metal-sealing material-feedthrough and utilization of the metal-sealing material feedthrough with an airbag, a belt tensioning device, and an ignition device |
US8733250B2 (en) | 2006-01-27 | 2014-05-27 | Schott Ag | Metal-sealing material-feedthrough and utilization of the metal-sealing material feedthrough with an airbag, a belt tensioning device, and an ignition device |
US20100064923A1 (en) * | 2006-11-28 | 2010-03-18 | Schott Ag | Firing apparatus for a pyrotechnic protection apparatus |
DE112007002750B4 (en) * | 2006-11-28 | 2014-11-20 | Schott Ag | Ignition device for a pyrotechnic protection device |
US8205554B2 (en) | 2006-11-28 | 2012-06-26 | Schott Ag | Firing apparatus for a pyrotechnic protection apparatus |
US9057590B1 (en) * | 2010-04-09 | 2015-06-16 | Bae Systems Information And Electronic Systems Integration Inc. | Enhanced reliability miniature piston actuator for an electronic thermal battery initiator |
US8607703B2 (en) * | 2010-04-09 | 2013-12-17 | Bae Systems Information And Electronic Systems Integration Inc. | Enhanced reliability miniature piston actuator for an electronic thermal battery initiator |
US20120186477A1 (en) * | 2010-04-09 | 2012-07-26 | Bae Systems Information And Electronic Systems Integration Inc. | Enhanced reliability miniature piston actuator for an electronic thermal battery initiator |
US9423218B2 (en) | 2010-09-17 | 2016-08-23 | Schott Ag | Method for producing a ring-shaped or plate-like element |
US9651345B2 (en) | 2010-09-17 | 2017-05-16 | Schott Ag | Method for producing a ring-shaped or plate-like element |
US10684102B2 (en) | 2010-09-17 | 2020-06-16 | Schott Ag | Method for producing a ring-shaped or plate-like element |
DE102014219125A1 (en) * | 2014-09-23 | 2016-03-24 | Schott Ag | Feedthrough element with directly connected ground pin, process for its preparation and its use |
DE102014219127A1 (en) * | 2014-09-23 | 2016-03-24 | Schott Ag | Feedthrough element with welded ground pin, method for its production and its use |
WO2018010712A1 (en) | 2016-07-11 | 2018-01-18 | Günter Dürschinger | Base body for an ignition capsule for occupant restraint systems |
DE102016008543B3 (en) * | 2016-07-11 | 2018-01-04 | Elisabeth Dürschinger | Basic body for a detonator for occupants - restraint systems |
Also Published As
Publication number | Publication date |
---|---|
US6612241B2 (en) | 2003-09-02 |
AU2002228622A1 (en) | 2002-06-18 |
WO2002046686A2 (en) | 2002-06-13 |
WO2002046686A3 (en) | 2003-05-22 |
US20030056679A1 (en) | 2003-03-27 |
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AS | Assignment |
Owner name: SPECIAL DEVICES, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AVETISIAN, VAHAN;BERG, PAUL;RENZ, ROBERT;REEL/FRAME:011698/0568 Effective date: 20010404 |
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AS | Assignment |
Owner name: FOOTHILL CAPITAL CORPORATION, CALIFORNIA Free format text: SECURITY AGREEMENT;ASSIGNOR:SPECIAL DEVICES, INCORPORATED;REEL/FRAME:011987/0618 Effective date: 20010627 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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AS | Assignment |
Owner name: SPECIAL DEVICES, INCORPORATED, CALIFORNIA Free format text: NUNC PRO TUNC ASSIGNMENT;ASSIGNOR:WELLS FARGO FOOTHILL, INC.;REEL/FRAME:023519/0617 Effective date: 20091110 |