EP0276252B1 - Screw rotor compressor - Google Patents
Screw rotor compressor Download PDFInfo
- Publication number
- EP0276252B1 EP0276252B1 EP87904634A EP87904634A EP0276252B1 EP 0276252 B1 EP0276252 B1 EP 0276252B1 EP 87904634 A EP87904634 A EP 87904634A EP 87904634 A EP87904634 A EP 87904634A EP 0276252 B1 EP0276252 B1 EP 0276252B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- low pressure
- rotor
- working space
- compressor
- port
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/18—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber
Definitions
- the present invention relates to a screw rotor compressor of the kind specified in the preamble of the claim.
- a screw rotor compressor is disclosed in US patent No. 4 435 139 and comprises a casing composed of a barrel portion and two end plate portions enclosing a working space generally in the shape of two intersecting bores and provided with low pressure and high pressure ports.
- a pair of intermeshing male and female rotors provided with external helical lands and grooves are rotatably mounted within the working space for sealing cooperation with each other and with the walls of the working space. During the rotation of the rotors a pair of rotor grooves are brought into communication with the low pressure port and continuously filled with low pressure gas.
- Two such grooves brought out of communication with the low pressure port are then brought into communication with each other at the low pressure end wall, as a land of the female rotor starts to enter the male rotor groove, whereby the free volume of the male rotor groove decreases to a certain value before a male rotor land starts to enter the female rotor groove.
- the total volume of the two grooves combined in a chevron-shaped chamber will thus be reduced by about 20 % before the full intermesh of the rotors completely takes over the sealing at the axial low pressure end of the chamber.
- the object of the present invention is to make it possible to reduce the volumetric capacity of a compressor running at low speed beyond the reduction corresponding to the speed reduction.
- the screw compressor shown in Figs. 1 and 2 comprises a casing 10 forming a working space 12 substantially in the form of two intersecting cylindrical bores having parallel axes.
- the casing 10 is further provided with a low pressure channel 14 and a high pressure channel 16 for the working fluid which channels communicate with the working space 12 through a low pressure port 18 and a high pressure port 20, respectively.
- the low pressure port 18 is located in its entirety in the low pressure end wall 22 of the working space 12 and extends mainly on one side of the plane containing the axes of the bores.
- the high pressure port 20 of the compressor shown is located partly in the high pressure end wall 24 of the working space 12 and partly in its barrel wall 26 and it is in its entirety located on the side of the plane through the axes of the bores opposite to the low pressure port 18.
- rotors In the working space 12 are provided two cooperating rotors, viz. a male rotor 28 and a female rotor 30, located with their axes coinciding with the axes of the bores. These rotors are joumaled in the casing 10 in cylindrical roller bearings 32 in the low pressure end wall and in pairs of ball bearings 34 with shoulders in the high pressure end wall 24.
- One rotor is further provided with a stub shaft 36 projecting outside the casing 10.
- the male rotor 28 has five helical lands 38 and intervening grooves 40 having a wrap angle of about 300°.
- the female rotor 30 has six helical lands 42 and intervening grooves 44 having a wrap angle of about 250°.
- a plurality of oil injection channels 54 opening at the intersection line 56 between the two bores forming the working space 12. These channels 54 form communications between an oil supply chamber 58 and the working space 12. Oil is supplied to this chamber from a pressure oil source not shown through a supply opening 60 under a pressure higher than the pressure prevailing in the working space 12 at the openings of the channels 54.
- a standard inlet port 18 is shown where the closing edge 64 thereof on the male rotor side is shaped correspondingly to the leading flank 62 of a male rotor land 38 which means that the groove 40 preceding the land 38 is cut off simultaneously along its complete radial extent.
- Fig.2B an inlet port 18 according to the invention is shown.
- the closing edge on the male rotor side is composed of two sections, an outer one 66 extending over about 2/3 of the radial extent of the port 18 and having a shape corresponding to that of the edge 64 in Fig. 2A and inner portion 68 providing a wedge-shaped extension 70 of the port 18 along the inner periphery thereof.
- extension 70 acts as a by-pass port at low rotor speeds whereas at high rotor speeds the extension 70 will not influence upon the function of the compressor.
- Fig. 3 the variation of the capacity as a function of the rotor speed is shown by a continuous line compared with the corresponding variation when using a standard port shown by a dashed line.
- the torque for driving the rotors with a port according to the invention will be considerably less than that with a standard port.
- Fig. 4 the variation of the torque as a function of the rotor speed is shown by a continuous line compared with the corresponding variation when using a standard port shown by a dashed line.
Abstract
Description
- The present invention relates to a screw rotor compressor of the kind specified in the preamble of the claim.
- A screw rotor compressor is disclosed in US patent No. 4 435 139 and comprises a casing composed of a barrel portion and two end plate portions enclosing a working space generally in the shape of two intersecting bores and provided with low pressure and high pressure ports. A pair of intermeshing male and female rotors provided with external helical lands and grooves are rotatably mounted within the working space for sealing cooperation with each other and with the walls of the working space. During the rotation of the rotors a pair of rotor grooves are brought into communication with the low pressure port and continuously filled with low pressure gas. Two such grooves brought out of communication with the low pressure port are then brought into communication with each other at the low pressure end wall, as a land of the female rotor starts to enter the male rotor groove, whereby the free volume of the male rotor groove decreases to a certain value before a male rotor land starts to enter the female rotor groove. The total volume of the two grooves combined in a chevron-shaped chamber will thus be reduced by about 20 % before the full intermesh of the rotors completely takes over the sealing at the axial low pressure end of the chamber.
- Owing to the centrifugal forces acting upon the gas enclosed in a groove when the rotors revolve, the pressure at the outer periphery will be higher than that at the bottom of the groove. This pressure differential increases with the speed of the rotor which means that the pressure rise at the bottom of the groove owing to the initial volume reduction may be negligible at high speed whereas it may be significant at low speed.
- The object of the present invention is to make it possible to reduce the volumetric capacity of a compressor running at low speed beyond the reduction corresponding to the speed reduction.
- According to the invention this has been attained in that a compressor of the kind in question has got the features specified in the characterizing portion of the claim.
- At low rotor speed there will be a considerable pressure difference over this cut away portion between the groove and the low pressure channel, simultaneously as the time before the closing thereof by the male rotor land is also considerable. This means that a certain amount of the gas in the groove may be passed back to the low pressure channel without the consumption of any significant power for the compression thereof. At high rotor speed on the other hand the pressure difference is negligible simultaneously as the time for closing the wedge-shaped portion is reduced which means that practically no leakage back to the low pressure channel will take place under such conditions The invention will now be described more in detail in connection with the embodiment of a compressor shown in the annexed drawings, where
- Fig. 1 is a vertical section through a screw compressor,
- Fig. 2A is a partial transverse section taken along line 2-2 in Fig. 1 and showing a normal low pressure port,
- Fig.2B is a partial transverse section taken along line 2-2 in Fig. 1 and showing a low pressure port according to the invention
- Fig. 3 shows the volumetric capacity as a function of the rotor speed,
- Fig. 4 shows the torque required as a function of the rotor speed, and
- Fig.5 shows the efficiency of the compressor as a function of the capacity.
- The screw compressor shown in Figs. 1 and 2 comprises a
casing 10 forming a workingspace 12 substantially in the form of two intersecting cylindrical bores having parallel axes. Thecasing 10 is further provided with alow pressure channel 14 and ahigh pressure channel 16 for the working fluid which channels communicate with theworking space 12 through alow pressure port 18 and a high pressure port 20, respectively. - In the compressor shown the
low pressure port 18 is located in its entirety in the lowpressure end wall 22 of theworking space 12 and extends mainly on one side of the plane containing the axes of the bores. The high pressure port 20 of the compressor shown is located partly in the highpressure end wall 24 of theworking space 12 and partly in itsbarrel wall 26 and it is in its entirety located on the side of the plane through the axes of the bores opposite to thelow pressure port 18. - In the
working space 12 are provided two cooperating rotors, viz. amale rotor 28 and afemale rotor 30, located with their axes coinciding with the axes of the bores. These rotors are joumaled in thecasing 10 incylindrical roller bearings 32 in the low pressure end wall and in pairs ofball bearings 34 with shoulders in the highpressure end wall 24. One rotor is further provided with astub shaft 36 projecting outside thecasing 10. - The
male rotor 28 has fivehelical lands 38 and interveninggrooves 40 having a wrap angle of about 300°. Thefemale rotor 30 has sixhelical lands 42 and interveninggrooves 44 having a wrap angle of about 250°. - In the
barrel wall 26 of theworking space 12 are provided a plurality ofoil injection channels 54 opening at theintersection line 56 between the two bores forming theworking space 12. Thesechannels 54 form communications between anoil supply chamber 58 and theworking space 12. Oil is supplied to this chamber from a pressure oil source not shown through a supply opening 60 under a pressure higher than the pressure prevailing in the workingspace 12 at the openings of thechannels 54. - In Fig. 2A. a
standard inlet port 18 is shown where theclosing edge 64 thereof on the male rotor side is shaped correspondingly to the leadingflank 62 of amale rotor land 38 which means that thegroove 40 preceding theland 38 is cut off simultaneously along its complete radial extent. - In Fig.2B an
inlet port 18 according to the invention is shown. The closing edge on the male rotor side is composed of two sections, an outer one 66 extending over about 2/3 of the radial extent of theport 18 and having a shape corresponding to that of theedge 64 in Fig. 2A andinner portion 68 providing a wedge-shaped extension 70 of theport 18 along the inner periphery thereof. - As already stated above in the introduction of the specification the
extension 70 acts as a by-pass port at low rotor speeds whereas at high rotor speeds theextension 70 will not influence upon the function of the compressor. - In Fig. 3 the variation of the capacity as a function of the rotor speed is shown by a continuous line compared with the corresponding variation when using a standard port shown by a dashed line.
- As the losses in the by-pass port are very low compared with the losses for decreasing the speed of a frequency controlled motor the torque for driving the rotors with a port according to the invention will be considerably less than that with a standard port.
- In Fig. 4 the variation of the torque as a function of the rotor speed is shown by a continuous line compared with the corresponding variation when using a standard port shown by a dashed line.
- The efficiency of the compressor at low speed will consequently be considerably higher with the new port compared to a standard one, which is shown in Fig. 5 shown by a continuous line and a dashed line, respectively.
Claims (1)
- Screw rotor compressor drivingly connected to a prime mover with variable speed and comprising a casing (10) with a working space (12) having a barrel (26) and a low pressure (22) and a high pressure (24) end wall and provided with spaced apart low pressure (18) and high pressure (20) ports at least partially disposed in said end walls (22, 24), and a pair of intermeshing male (28) and female (30) rotors having external helical lands (38, 42) and grooves (40, 44) disposed in said working space (12), characterized in that the closing edge (66, 68) of the axial low pressure port (18) on the male rotor side has a radially outer portion (66) and a radially inner portion (68), which radially outer portion (66) follows a curve substantially corresponding to the shape of the leading flank (62) of a male rotor land (38), and which radially inner portion (68) projects into the area of the low pressure end wall (22) bounding the compression phase of the compressor, thereby forming a wedge-shaped notch (70) extending into said area.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87904634T ATE49265T1 (en) | 1986-07-08 | 1987-06-26 | ROTARY SCREW COMPRESSOR. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8616596 | 1986-07-08 | ||
GB868616596A GB8616596D0 (en) | 1986-07-08 | 1986-07-08 | Screw rotor compressor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0276252A1 EP0276252A1 (en) | 1988-08-03 |
EP0276252B1 true EP0276252B1 (en) | 1990-01-03 |
Family
ID=10600719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87904634A Expired - Lifetime EP0276252B1 (en) | 1986-07-08 | 1987-06-26 | Screw rotor compressor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0276252B1 (en) |
GB (1) | GB8616596D0 (en) |
WO (1) | WO1988000294A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5228301A (en) * | 1992-07-27 | 1993-07-20 | Thermo King Corporation | Methods and apparatus for operating a refrigeration system |
US5246357A (en) * | 1992-07-27 | 1993-09-21 | Westinghouse Electric Corp. | Screw compressor with oil-gas separation means |
US5857683A (en) * | 1996-04-03 | 1999-01-12 | Carl Clark Auel Living Will | Creeper having lever arms providing variable mechanical advantage for inclining a back portion |
US6705849B2 (en) * | 2002-07-22 | 2004-03-16 | Carrier Corporation | Discharge porting design for screw compressor |
US6821098B2 (en) * | 2003-02-11 | 2004-11-23 | Carrier Corporation | Screw compressor having compression pockets closed for unequal durations |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435139A (en) * | 1981-02-06 | 1984-03-06 | Svenska Rotor Maskiner Aktiebolag | Screw rotor machine and rotor profile therefor |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2457314A (en) * | 1943-08-12 | 1948-12-28 | Jarvis C Marble | Rotary screw wheel device |
US2474653A (en) * | 1945-04-26 | 1949-06-28 | Jarvis C Marble | Helical gear compressor or motor |
US2642003A (en) * | 1949-12-16 | 1953-06-16 | Read Standard Corp | Blower intake port |
GB966529A (en) * | 1959-09-01 | 1964-08-12 | Svenska Rotor Maskiner Ab | Screw rotor compressor |
US3622256A (en) * | 1969-10-14 | 1971-11-23 | Alexandr Ivanovich Borisoglebs | Screw-rotor machine |
SE428043C (en) * | 1981-09-15 | 1989-12-14 | Stal Refrigeration Ab | COMPRESSOR WITH RADIAL INPUT TO A SCREW ROTOR |
SE428312B (en) * | 1982-09-20 | 1983-06-20 | Svenska Rotor Maskiner Ab | Rotor pair for screw-rotor machine |
-
1986
- 1986-07-08 GB GB868616596A patent/GB8616596D0/en active Pending
-
1987
- 1987-06-26 EP EP87904634A patent/EP0276252B1/en not_active Expired - Lifetime
- 1987-06-26 WO PCT/SE1987/000305 patent/WO1988000294A1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435139A (en) * | 1981-02-06 | 1984-03-06 | Svenska Rotor Maskiner Aktiebolag | Screw rotor machine and rotor profile therefor |
Also Published As
Publication number | Publication date |
---|---|
EP0276252A1 (en) | 1988-08-03 |
GB8616596D0 (en) | 1986-08-13 |
WO1988000294A1 (en) | 1988-01-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2481527A (en) | Rotary multiple helical rotor machine | |
US3275226A (en) | Thrust balancing and entrapment control means for screw type compressors and similardevices | |
US2480818A (en) | Helical rotary fluid handling device | |
US3834842A (en) | Hydraulic power translating device | |
US3910731A (en) | Screw rotor machine with multiple working spaces interconnected via communication channel in common end plate | |
US4222716A (en) | Combined pressure matching and capacity control slide valve assembly for helical screw rotary machine | |
GB1220054A (en) | Two-stage compressor of the meshing screw rotor type | |
US8936450B2 (en) | Roots fluid machine with reduced gas leakage | |
EP1890038A2 (en) | Screw pump | |
JP3026819B2 (en) | Rotary compressor with oil discharge device | |
US4076468A (en) | Multi-stage screw compressor interconnected via communication channel in common end plate | |
US3182900A (en) | Twin rotor compressor with mating external teeth | |
US3994638A (en) | Oscillating rotary compressor | |
US3690793A (en) | Gear pump with lubricating means | |
US3447472A (en) | Gearing and lubricating means therefor | |
US3986801A (en) | Screw compressor | |
US3995978A (en) | Hydraulic fluid pressure device and porting arrangement therefor | |
US3773444A (en) | Screw rotor machine and rotors therefor | |
US4776779A (en) | Fluid motor or pump | |
US5071328A (en) | Double rotor compressor with two stage inlets | |
EP0276252B1 (en) | Screw rotor compressor | |
US4316707A (en) | Gerotor with valve plate attached to rotor | |
EP0466351B1 (en) | Improvements relating to gerotor pumps | |
US3865523A (en) | Continuous flow rotary pump | |
US2642003A (en) | Blower intake port |
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 |
|
17P | Request for examination filed |
Effective date: 19880420 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI NL SE |
|
17Q | First examination report despatched |
Effective date: 19881108 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI NL SE |
|
REF | Corresponds to: |
Ref document number: 49265 Country of ref document: AT Date of ref document: 19900115 Kind code of ref document: T |
|
ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO MILANO S.P.A. |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3761322 Country of ref document: DE Date of ref document: 19900208 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19900626 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19900630 Ref country code: CH Effective date: 19900630 |
|
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 | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
ITTA | It: last paid annual fee | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19940630 Year of fee payment: 8 |
|
EAL | Se: european patent in force in sweden |
Ref document number: 87904634.0 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19960101 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19960101 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20051117 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20051118 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20051122 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20051123 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20051130 Year of fee payment: 19 |
|
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 NON-PAYMENT OF DUE FEES Effective date: 20060626 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060627 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060630 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20060630 Year of fee payment: 20 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070103 |
|
EUG | Se: european patent has lapsed | ||
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20060626 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20070228 |
|
BERE | Be: lapsed |
Owner name: *SVENSKA ROTOR MASKINER A.B. Effective date: 20060630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060630 |