EP0051474B1 - Thermostatic switch - Google Patents

Thermostatic switch Download PDF

Info

Publication number
EP0051474B1
EP0051474B1 EP19810305182 EP81305182A EP0051474B1 EP 0051474 B1 EP0051474 B1 EP 0051474B1 EP 19810305182 EP19810305182 EP 19810305182 EP 81305182 A EP81305182 A EP 81305182A EP 0051474 B1 EP0051474 B1 EP 0051474B1
Authority
EP
European Patent Office
Prior art keywords
spring
movable
plate member
movable contact
housing
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
Application number
EP19810305182
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0051474A2 (en
EP0051474A3 (en
Inventor
Henry J. Boulanger
Andrew C. Mcguirk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Texas Instruments Inc
Original Assignee
Texas Instruments Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US06/203,790 external-priority patent/US4349806A/en
Priority claimed from US06/203,071 external-priority patent/US4334210A/en
Application filed by Texas Instruments Inc filed Critical Texas Instruments Inc
Publication of EP0051474A2 publication Critical patent/EP0051474A2/en
Publication of EP0051474A3 publication Critical patent/EP0051474A3/en
Application granted granted Critical
Publication of EP0051474B1 publication Critical patent/EP0051474B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H2037/5454—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting with separate spring biasing the bimetal snap element against the heat transfer surface

Definitions

  • This invention relates generally to thermostatic switches and more specifically to a small, mass producible switch in which gauging and calibration is obviated.
  • a typical prior art switch is shown and disclosed in US-A-3,164,701.
  • a switch which comprises a housing in which a switch cavity is formed.
  • a stationary contact and a flexible, cantilever mounted movable contact arm are mounted in the switch cavity.
  • An opening is formed in the housing which is closed by a thermally conductive cap trapping a snap-acting, thermally responsive disc between the cap and the housing.
  • a motion transfer pin is slidably disposed in the housing extending between the movable contact arm and the disc so that when the disc snaps from one configuration to another, its motion is transferred to the movable contact arm to open or close the electrical connection between the stationary contact and the movable contact arm.
  • Switches of this type have been very effective and many hundreds of thousands have been made and sold throughout the world, however, such switches have certain limitations in today's market place. For example, calibration of the switch is required including positioning of the stationary terminal by bending the support on which the stationary contact is mounted and bending of a separate member overlying the movable contact arm in order to obtain a desired contact force. Such calibration not only requires extra parts such as calibration screws, but also adds significantly to the cost of assembly. Further, such switches are designed to carry appreciable current, in the order of 10 to 15 amps, for example, thus serving to limit the design of the movable arm.
  • an electrical switch comprising a housing forming a switch cavity therein, the housing having an open end, a thermally responsive snap-action disc disposed at the open end, a heat conductive cap attached to the housing over the disc in heat transfer relation therewith, a stationary electrical contact mounted in the switch cavity, movable electrical contact means mounted in the switch cavity and having a movable electrical contact adapted to move in opposite directions into and out of engagement with the stationary electrical contact characterized in that the movable electrical contact means has a relatively inflexible, movable contact arm portion and low spring rate biasing means urging the movable contact arm position in one direction, and motion transfer msans mounted in the housing and adapted to transfer motion in the opposite direction from the thermally responsive disc to the movable electrical contact means.
  • a relatively inflexible movable contact arm is mounted on a first of two plate members which extend in parallel directions into a switch cavity and is adapted to move into and out of engagement with a stationary contact mounted on the second plate member.
  • a low spring rate spring system for example of the order of two pounds per inch (360 g per cm), urges the movable contact arm toward the stationary contact.
  • the desired contact force of the order of one to two ounces (28-57 g) is obtained by displacing a portion of a flat spring attached to a face of one plate member in a direction away from the second plate member.
  • inventions employ a spring clip and pivotably mount the inflexible movable contact arm on a free distal portion of the first plate member with the spring clip attached at one point to the movable contact member on the side of the first plate member removed from the second plate member and attached at another point to the first plate member.
  • the movable arm portion and the spring portion are integrally formed with the spring portion mounted on the first plate member and so formed that the spring portion includes a part thereof extending away from the second plate member.
  • the housing is symmetrically formed as a cylindrical cup with two slots in the bottom wall for receiving respective plate members which are securely fastened in the housing either by staking the terminals to the housing or by forming the plate members with a plurality of protrusions extending from an end face and abutting a major surface of a terminal blade with the end face with the protrusions extending through apertures in the terminal blade.
  • the protrusions are then headed over to achieve a solid metal to metal connection.
  • the open end of the housing is formed with a plurality of plateaus raised from a ledge which interfit with a thermally conductive cap.
  • a motion transfer sheet of flexible resinous film having lab portions projecting from its periphery is received on the ledge with the tabs disposed between the plateaus and a snap-acting, thermally responsive disc is disposed between the cap and the resinous sheet which is formed so that the disc is maintained in optimum heat transfer relation with the cap.
  • the spring clip can be inserted conveniently into the switch and merely by-pushing it with or without a special tool clamped into position.
  • the spring rate for the Figure 1a model has been reduced by a factor of 3.
  • a spring rate of approximately two pounds per inch (0.36 Kg per cm) was obtained as compared to the conventional spring rate in excess of ten pounds per inch (1.79 Kg per cm) in prior art devices.
  • the desired level of contact force is generated by the reaction R by displacing member c to the left as seen in Figure 1b.
  • the block at R does not exist as such, but is used for purposes of illustration and the mathematics involved.
  • This displacement may be achieved in practice by any of several ways as by utilizing the thickness of movable contact arm to which the spring is attached or by forming the spring into a particular configuration.
  • the calculations were set up with both a and b members as flexible, however, in order to assure optimum contact attitudes, that is the orientation of the movable contact relative to the stationary contact, it is preferred to make members a and b inflexible as in assuming l a as in assuming l a and I b »i c .
  • Thermostatic switch 010 comprises a symmetrical, generally cylindrical cup-shaped housing having a bottom wall 12 and side wall 14 depending therefrom.
  • the housing is composed of any suitable moldable electrically insulative material such as Ryton, a ⁇ registered trademark of Phillips Petroleum Co. for polyphenylene sulfide resins.
  • Two parallel extending slots 16, 18 extend through bottom wall 12 and provide access for first and second generally rectangular plate members 020, 022 formed of a suitable electrically conductive material such as commercial bronze or cadmium copper.
  • Plate members 020, 022 extend into a switch cavity 24 formed within cylindrical wall 14.
  • the outer diameter of wall 14 may be in the order of one-half inch (1.27 cm) so the space within switch cavity 24 must be used very efficiently to make a device which is not only electrically effective, but also easy and inexpensive to assemble.
  • First plate member 020 is formed with a flat spring member 058 which is attached to plate member 020 along a major surface portion of the body 026 of plate member 020.
  • Spring 058 is formed with a tongue portion 059 struck from the central portion of the spring so that it depends from top portion of the spring and is attached, as by rivets 061 to an inflexible movable contact arm 074 which is pivotably mounted on free distal surface 030 of plate member 020. Thethickness of the movable arm on the side of the first plate removed from the second plate member 022 displaces tongue portion 059 in order to obtain a selected contact force.
  • This arrangement results in a reaction force of the movable arm against the first plate member which is large relative to the force exerted between movable contact 90 mounted in the free distal end of movable arm 074 and stationary contact 50 mounted on second plate member 022.
  • the force of the movable arm against the first plate member is in the order of half a pound (227 g) as compared to a contact force of approximately one ounce (28 g). That is, and
  • This large reaction force permits the use of a spring which need not be relied on to carry current since the current can pass from the plate member directly to the movable arm.
  • the spring can be formed of stainless steel or other high temperature material irrespective of its electrical conductivity thereby enabling use of the switch at temperatures of up to 450°F (232°C) or high as opposed to prior art devices where a high conductivity material such as a copper alloy with limited strength at high temperatures was required for the current-carrying spring member.
  • An opening is preferably provided in plate member 020 to insure that pivoting movement of movable arm 074 is not inhibited by any interference with that portion of the plate member.
  • Motion is transferred to motion transfer portion 080 of movable arm 074 by means of a thermally responsive snap-acting disc 100 to which heat is conducted via cap 102.
  • disc 100 Upon being heated to a predetermined temperature, disc 100 will snap from one dished configuration to an oppositely formed dished configuration, ie., from upwardly facing convex to upwardly facing concave and transfer motion through a flexible, electrically insulative sheet 96 to force the movable contact from the solid line contacts engaged position to the dashed line contacts disengaged position. Further details on the particular constructional details of sheet 96 will be given below in connection with another embodiment of the invention.
  • a low spring rate spring system can be used with the desired level of contact force by employing the same type of reaction force while using a spring clip.
  • a switch 10 comprises a cylindrical cup shaped housing of the type shown in Figure 2.
  • First plate member 20 as seen in Figure 8, comprises a body portion 26 from which two fingers 28 extend upwardly terminating at a free distal end portion 30.
  • a third finger 32 extends laterally and is used to provide a spring seat.
  • At least one but preferably two projections, 34 project downwardly from body portion 26 and are received respectively in apertures 36 in a terminal blade 38 (see Figure 15) and headed over to securely fix plate member 20 in the housing.
  • a major surface area of blade 38 squarely against the end face of plate member 20 a tight, solid connection is obtained without reliance on plastic or soldering.
  • bosses 40 are formed in bottom wall 12 of the housing to add further support.
  • Second plate member 22 is formed with a body portion 42 of generally the same size as body portion 26 and is provided with projections 34 depending downwardly therefrom which are to be received in apertures 36 of terminal blade 44. Terminal blades 38, 44 are shown projecting outwardly from the housing, however, it will be realized that they could be bent in any desired direction.
  • Plate member 22 is formed with a window portion 46 defined by a frame 48. Attached to the bottom surface of the top portion of frame 48 so that it extends through window 46 is a stationary contact 50.
  • Contact 50 is attached by any suitable method, as by welding, and is preferably formed with a cylindrically rounded outer mating surface as indicated at 52.
  • Movable contact 90 mounted on movable arm 74 to be discussed below, has a similarly shaped outer mating surface but with its longitudinal axis disposed at right angles to that of surface 52 so that essentially a point contact engagement is achieved when the contacts are in the closed or contacts engaged position.
  • terminal blade integral with the plate member In some instances it may be desired to make the terminal blade integral with the plate member. This is accomplished, as seen in Figure 16, by providing terminal portion 54 and staking portion 56 on either side of portion 54. As shown by the dashed lines staking portions are bent outwardly after the plate member is put in place to securely fix the plate member to the housing.
  • a low spring rate Spring clip 58 is formed in a generally U-shaped configuration having a bight portion 60 joining two depending legs 62, 64.
  • Legs 62 is formed with a tab 66 through what a slot 68 is formed and leg 64 is formed with a channel portion 70 with a slot 72 formed through a portion thereof.
  • tab 86 of movable arm 74 is placed through slot 68 of spring clip 58 with the spring passing through window 84 and depending legs 69 of movable arm 74 received in channel portion 70.
  • the movable arm 74 carrying spring clip 58 is then inserted into switch cavity 24 so that pivot surface 88 is placed on distal free end surface 30 of first plate member 20 and pushed downwardly.
  • slot 72 becomes adjacent to the free distal end of finger 32 of plate member 20 and that end of spring clip 58 is transferred from legs 69 to finger 32.
  • a plurality of accurately shaped plateaus 92 project upwardly from ledge 94 formed at the distal free end of cylindrical wall 14.
  • a sheet 96 of suitable flexible electrically insulative material such as Kapton, a trademark of DuPont de Nemours Company for an aromatic thermoplastic polyimide film, having a plurality of tabs 98 is placed on ledge 94 with the tabs fitting between the spaced plateaus.
  • a thermally responsive, snap-acting disc 100 is disposed on top of sheet 96 and a thermally conductive cap 102 formed of any suitable heat conducting material such as aluminum is received over and closes the open end of the housing maintaining sheet 96 and disc 100 in place.
  • sheet 96 is bent to form a spring system to maintain disc 100 in optimum heat transfer with cap 102.
  • tabs 98 are bent out of the plane of the sheet in order to urge disc 100 against cap 102 in optimum heat transfer relation therewith. Bending of the tabs up and down may be alternated in order to allow assembly with either face adjacent to the disc.
  • Cap 102 is formed with a plurality of recessed portions 104 adapted to fit between the plateaus and spaced a selected distance from the ledge to form a seat for the snap-acting disc.
  • This arrangement provides a crush-proof mount for the cap due to the solid backing of the plateaus at the same time that the disc is received in a seat which avoids any chance of being trapped in a skew orientation. Additionally, the height of the housing can be minimized by the extra distance of electrical insulation from the outer end portions of the plate members 20, 22 provided by the tab portion 98 of sheet 96 isolating the switching components from the cap 102.
  • This thermally conductive cap 102 conducts heat from the environment, transfers it to disc 100 which, upon reaching a selected temperature snaps from an upwardly facing convex configuration shown to the opposite upwardly facing concave configuration forcing motion transfer portion 80 of movable arm 74, through flexible sheet 96, downwardly against the urging of spring 58 to thereby separate contact 90 from stationary contact 50 as shown in the dashed line position.
  • FIG. 17-22 a second embodiment utilizing a spring clip is shown in which a housing is composed of material similar to that of the previous embodiments and has cylindrical side wall 114 and bottom wall 112 with parallel slots extending through the bottom wall.
  • the Figure 17 embodiment provides more electrical isolation between terminals 38, 44 and a support means used to mount the switch to a surface to be monitored. Since switch cavity 124 is of a lower profile, plate members 120, 122 are somewhat shorter in height compared to like members in the aforementioned embodiment.
  • first plate member 120 is formed with projections 134 depending downwardly from body portion 126 and has distal free end surface 130 formed on the upper part of body portion 126.
  • Notch 132 is formed to provide a spring seat and has a slot 133 in communication therewith for a purpose to be explained below.
  • Second plate member 122 is formed essentially in the same configuration as plate member 22, but of a shorter height.
  • Movable arm 74 is of the same configuration as arm 74 and therefore will not be redescribed.
  • spring rate clip 158 has a configuration somewhat similar to clip 58 in that it has a bight portion 160 joining legs 162 and 1,64, however, leg 164 is bent back on itself to form an end portion 164.
  • a slot 168 is formed in leg 162 along with an aperture 169.
  • a tab 171 is formed at distal free end portion 165.
  • a finger 183 is received through aperture 169 and captures bight 160 between it and surface portion of tool 181 configured in a shape complimentary to the relevant portion of clip 158.
  • Finger 183 is spring biased (not shown) toward the body of tool 191 and is movable to the dashed line position.
  • Clip 158 is picked up with tool 181 and is inserted into switch chamber 124 after movable arm 74 has already been put in place with movable contact 90 below stationary contact 150 and pivot surface 88 received on distal surface 130 of first plate member 120.
  • Figure 162 is slipped over the left hand portion of movable arm 74 (as seen in Figure 17) with leg 164 received through window 84.
  • leg 164 engages bottom wall 112 of the housing finger 183 is caused to move to the dashed line position (through slot 133 seen in Figure 22) forcing tab 171 of leg 164 into spring seat slot 132 in first plate member 120. Finger 183 is then removed from aperture 169 with the spring clip in place.
  • Spring 158 transfers force through movable arm 74 causing the movable arm to pivot on surface 130 causing movable contact 90 to engage stationary contact 150 with the desired contact force.
  • Thermally conductive cap 102 conducts heat from the environment, transfers it to disc 100 which, when reaching a selected temperature snaps from the upwardly facing convex configuration shown to the opposite upwardly facing concave configuration force, motion transfer portion 80 of movable arm 74, through flexiblesheet 96, downwardly against the bias of spring 158 to thereby separate contact 90 from stationary contact 150.
  • Figure 23 shows yet another embodiment in which first plate member 320 extends into the switch cavity 24 only slightly beyond bottom wall 12.
  • a flat plate portion of spring 358 formed of electrically conductive material such as beryllium copper is attached to member 320, as by welding.
  • Spring 358 is formed into a circular band of approximately 270°C so that it is displaced on the side of plate member 320 removed from second plate member 22 and is integrally attached to movable contact portion.
  • Movable contact arm portion 374 is rendered relatively inflexible by forming several ribs 375 along its length.
  • Contact 390 is mounted at the free distal end portion of movable contact arm portion 374 and is adapted to move into and out of engagement with stationary contact 50 mounted on second plate member 22.
  • a supplemental motion transfer element 381 in the form of a circular disc of electrically insulative material is slidingly received in oppositely disposed, vertically extending grooves 383 formed in the side wall 14.
  • motion from disc 100 is transferred through the flexible sheet 96 (not shown) and slidable member 381 to movable contact arm 374.
  • Figure 23 switching element can be used in a slow profile housing such as that shown in Figure 17.
  • a motion transfer member 481 shown in Figure 26 can be employed.
  • the curved surfaces received in the grooves of the side wall of the housing form a portion of a circle thereby allowing some rocking adjustment without any danger of jamming in the grooves.
  • the curves surfaces in the central part of member 481 form a part of a circle so that the transfer of motion from the disc to the movable arm will be uniform no matter what the angular orientation of member 481 within the housing.
  • a relatively low spring rate spring system is used to urge a relatively inflexible movable contact arm toward a stationary contact with a portion of the spring displaced to obtain a desired level of contact force. Due to the low spring rate system, the tolerance of the parts is not as critical as in prior art devices and calibration is obviated.
  • the spring used to urge the movable contact arm toward the stationary contact need not be current carrying due to the large reaction force resulting from displacing the spring and thus enabling the provision of a switch operable in a higher temperature environment than prior art switches.
  • normally closed switches have been shown and described, it is within the purview of the invention to employ the spring system with normally open devices as well.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
EP19810305182 1980-11-03 1981-10-30 Thermostatic switch Expired EP0051474B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/203,790 US4349806A (en) 1980-11-03 1980-11-03 Snap-acting thermostatic switch using inflexible, spring biased contact arm
US203071 1980-11-03
US06/203,071 US4334210A (en) 1980-11-03 1980-11-03 Thermostatic switch and method of making
US203790 1988-06-07

Publications (3)

Publication Number Publication Date
EP0051474A2 EP0051474A2 (en) 1982-05-12
EP0051474A3 EP0051474A3 (en) 1983-02-23
EP0051474B1 true EP0051474B1 (en) 1985-12-18

Family

ID=26898288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810305182 Expired EP0051474B1 (en) 1980-11-03 1981-10-30 Thermostatic switch

Country Status (4)

Country Link
EP (1) EP0051474B1 (ja)
JP (2) JPH02276123A (ja)
AR (1) AR227945A1 (ja)
DE (1) DE3173274D1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4570148A (en) * 1984-01-23 1986-02-11 Therm-O-Disc, Incorporated Snap disc condition sensor and method for producing the same
US5003282A (en) * 1989-07-19 1991-03-26 Texas Instruments Incorporated Trip free/reset free manual reset

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164701A (en) * 1961-05-29 1965-01-05 Texas Instruments Inc Method of assembling thermostatic switches
DE2237815C3 (de) * 1972-08-01 1978-11-23 Inter Control Hermann Koehler Elektrik Gmbh & Co Kg, 8500 Nuernberg Thermische Schaltvorrichtung
US4101861A (en) * 1976-03-15 1978-07-18 Texas Instruments Incorporated Thermostatic switch and method of assembly
US4079348A (en) * 1976-05-27 1978-03-14 Texas Instruments Incorporated Thermally responsive electrical switch
DE2721949A1 (de) * 1977-05-14 1978-11-23 Microtherm Gmbh Thermoschalter

Also Published As

Publication number Publication date
JPH02265138A (ja) 1990-10-29
EP0051474A2 (en) 1982-05-12
DE3173274D1 (en) 1986-01-30
JPH047054B2 (ja) 1992-02-07
AR227945A1 (es) 1982-12-30
JPH02276123A (ja) 1990-11-13
EP0051474A3 (en) 1983-02-23

Similar Documents

Publication Publication Date Title
US5804798A (en) Thermal protector with bimetal plate
EP1568108B1 (en) Battery connector
US4123737A (en) Bimetallic circuit breaker
US4394553A (en) Snap action switch
US4349806A (en) Snap-acting thermostatic switch using inflexible, spring biased contact arm
US5459295A (en) Reliable electrical connection between a stationary terminal and an armature of a switch
EP0714550B1 (en) Electric switches
US4424506A (en) Snap-acting mechanisms
US4816626A (en) Slide switch
EP0128978A1 (en) Thermostat
US4101861A (en) Thermostatic switch and method of assembly
EP0051474B1 (en) Thermostatic switch
US4334210A (en) Thermostatic switch and method of making
EP0392836A2 (en) Circuit protector construction
US4121073A (en) Condition responsive electrical switch having improved bridging contact means
US4782318A (en) Thermally responsive electric switch apparatus
US4255736A (en) Thermal protective switch
US4426632A (en) Snap-acting thermostatic switch using inflexible, spring biased contact arm
EP1517346B1 (en) Improvements relating to thermal controls for electric heating elements
US4151501A (en) Terminal mounting means for thermally actuated switches
US5229740A (en) Thermally responsive switch
US4414530A (en) Miniature motor protector apparatus and method for assembling thereof
US4316168A (en) Electrical circuit breaker having a bimetal plate member of rectangular configuration
US3763339A (en) Electrical switches
US5471024A (en) Electric switch having improved attachment of movable contact to contact carrier

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19830615

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed
AK Designated contracting states

Designated state(s): DE FR GB IT NL SE

REF Corresponds to:

Ref document number: 3173274

Country of ref document: DE

Date of ref document: 19860130

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 81305182.8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19990816

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000918

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20000929

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20001009

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 20001030

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20001030

Year of fee payment: 20

EUG Se: european patent has lapsed

Ref document number: 81305182.8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20011029

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20011030

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Effective date: 20011029

NLV7 Nl: ceased due to reaching the maximum lifetime of a patent

Effective date: 20011030