JPH0118500B2 - - Google Patents
Info
- Publication number
- JPH0118500B2 JPH0118500B2 JP53160842A JP16084278A JPH0118500B2 JP H0118500 B2 JPH0118500 B2 JP H0118500B2 JP 53160842 A JP53160842 A JP 53160842A JP 16084278 A JP16084278 A JP 16084278A JP H0118500 B2 JPH0118500 B2 JP H0118500B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- protective film
- head
- surface roughness
- magnetic disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000010408 film Substances 0.000 claims description 64
- 230000001681 protective effect Effects 0.000 claims description 47
- 230000003746 surface roughness Effects 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 239000010409 thin film Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000005388 borosilicate glass Substances 0.000 claims description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 21
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 18
- 238000000034 method Methods 0.000 description 17
- 229910001004 magnetic alloy Inorganic materials 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 5
- IGOJDKCIHXGPTI-UHFFFAOYSA-N [P].[Co].[Ni] Chemical compound [P].[Co].[Ni] IGOJDKCIHXGPTI-UHFFFAOYSA-N 0.000 description 5
- 239000006061 abrasive grain Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 235000019441 ethanol Nutrition 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000011232 storage material Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 3
- 238000004528 spin coating Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 2
- SYBYTAAJFKOIEJ-UHFFFAOYSA-N 3-Methylbutan-2-one Chemical compound CC(C)C(C)=O SYBYTAAJFKOIEJ-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229940093499 ethyl acetate Drugs 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropanol acetate Natural products CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 description 1
- 229940011051 isopropyl acetate Drugs 0.000 description 1
- GWYFCOCPABKNJV-UHFFFAOYSA-N isovaleric acid Chemical compound CC(C)CC(O)=O GWYFCOCPABKNJV-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000004439 roughness measurement Methods 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/72—Protective coatings, e.g. anti-static or antifriction
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/90—Magnetic feature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/9265—Special properties
- Y10S428/928—Magnetic property
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12382—Defined configuration of both thickness and nonthickness surface or angle therebetween [e.g., rounded corners, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12597—Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
- Y10T428/12604—Film [e.g., glaze, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12944—Ni-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component
Landscapes
- Magnetic Record Carriers (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16084278A JPS5584045A (en) | 1978-12-19 | 1978-12-19 | Magnetic memory substance and its manufacture |
| DE2948845A DE2948845C2 (de) | 1978-12-19 | 1979-12-05 | Magnetspeicherplatte und Verfahren zu deren Herstellung |
| US06/102,731 US4326229A (en) | 1978-12-19 | 1979-12-12 | Magnetic record member and process for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16084278A JPS5584045A (en) | 1978-12-19 | 1978-12-19 | Magnetic memory substance and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5584045A JPS5584045A (en) | 1980-06-24 |
| JPH0118500B2 true JPH0118500B2 (en]) | 1989-04-06 |
Family
ID=15723578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16084278A Granted JPS5584045A (en) | 1978-12-19 | 1978-12-19 | Magnetic memory substance and its manufacture |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4326229A (en]) |
| JP (1) | JPS5584045A (en]) |
| DE (1) | DE2948845C2 (en]) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5916139A (ja) * | 1982-07-20 | 1984-01-27 | Victor Co Of Japan Ltd | 磁気記録媒体 |
| DE3370710D1 (en) * | 1982-11-19 | 1987-05-07 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| JPS605423A (ja) * | 1983-06-22 | 1985-01-12 | Fujitsu Ltd | 連続磁性膜型磁気記録媒体 |
| US4558383A (en) * | 1983-06-30 | 1985-12-10 | International Business Machines Corporation | Information storage disk transducer position control system using a prerecorded servo pattern requiring no alignment with the storage disk |
| JPS60111338A (ja) * | 1983-11-21 | 1985-06-17 | Konishiroku Photo Ind Co Ltd | 磁気記録媒体及びその製造方法 |
| US4619872A (en) * | 1983-12-12 | 1986-10-28 | Digital Equipment Corporation | Magnetic plated media |
| DE3565694D1 (en) * | 1984-02-02 | 1988-11-24 | Hitachi Metals Ltd | Process for manufacturing magnetic recording media |
| JPH0610866B2 (ja) * | 1984-06-26 | 1994-02-09 | ティーディーケイ株式会社 | 磁気記録媒体 |
| US4923574A (en) * | 1984-11-13 | 1990-05-08 | Uri Cohen | Method for making a record member with a metallic antifriction overcoat |
| US4663193A (en) * | 1984-12-26 | 1987-05-05 | Hitachi Metals, Ltd. | Process for manufacturing magnetic recording medium |
| JPS6275932A (ja) * | 1985-09-27 | 1987-04-07 | Alps Electric Co Ltd | 磁気デイスク媒体 |
| US5082747A (en) * | 1985-11-12 | 1992-01-21 | Hedgcoth Virgle L | Magnetic recording disk and sputtering process and apparatus for producing same |
| DE3789932T2 (de) * | 1986-10-09 | 1995-02-09 | Asahi Glass Co Ltd | Glassubstrat für eine Magnetplatte und Verfahren zu seiner Herstellung. |
| DE8704667U1 (de) * | 1987-03-28 | 1987-07-30 | Basf Ag, 6700 Ludwigshafen | Magnetaufzeichnungsträger zu Testzwecken, insbesondere zur Eichung von Flug-Magnetköpfen |
| JPS63249933A (ja) * | 1987-04-03 | 1988-10-17 | Hitachi Ltd | 磁気デイスク媒体 |
| JPH01273218A (ja) * | 1988-04-25 | 1989-11-01 | Mitsubishi Electric Corp | 磁気デイスク |
| JPH02208826A (ja) * | 1989-02-08 | 1990-08-20 | Matsushita Electric Ind Co Ltd | 薄膜型磁気ディスク |
| US5062021A (en) * | 1990-03-12 | 1991-10-29 | Magnetic Peripherals Inc. | Selectively textured magnetic recording media |
| US5108781A (en) * | 1990-03-12 | 1992-04-28 | Magnetic Peripherals Inc. | Process for manufacturing selectively textured magnetic recording media |
| KR920702791A (ko) * | 1990-04-17 | 1992-10-06 | 다께바야시 쇼오고 | 광자기기록매체의 제조방법 및 광자기기록매체 |
| JPH03116416A (ja) * | 1990-04-27 | 1991-05-17 | Hitachi Ltd | 磁気ディスク媒体 |
| US5268207A (en) * | 1990-12-21 | 1993-12-07 | International Business Machines Corporation | Texturing the surface of a recording disk using particle impact |
| WO1993012520A1 (en) * | 1991-12-17 | 1993-06-24 | Certus Magnetics | Magnetic disk medium with designed textured surfaces and controlled surface roughness and method of providing same |
| US5768075A (en) | 1991-12-17 | 1998-06-16 | Baradun R&D Ltd. | Disk medium w/magnetically filled features aligned in rows and columns |
| US5605733A (en) * | 1992-01-22 | 1997-02-25 | Hitachi, Ltd. | Magnetic recording medium, method for its production, and system for its use |
| US5506017A (en) * | 1995-06-07 | 1996-04-09 | Komag Incorporated | Method for texturing magnetic media |
| US6048255A (en) * | 1995-08-22 | 2000-04-11 | Seagate Technology, Inc. | Pulsed laser surface treatments for magnetic recording media |
| US6335080B1 (en) * | 1999-01-04 | 2002-01-01 | Seagate Technology Llc | Magnetic disk media and disk drives utilizing polymeric disk substrates |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3055770A (en) * | 1960-12-23 | 1962-09-25 | Ibm | Thin magnetic films |
| US3466156A (en) * | 1966-12-01 | 1969-09-09 | Ncr Co | Magnetic record members |
| US3516860A (en) * | 1967-08-31 | 1970-06-23 | Singer Co | Method of forming a magnetic recording medium |
| US4171399A (en) * | 1971-09-02 | 1979-10-16 | Corning Glass Works | Magnetic recording and storage device having high abrasion resistance and method |
| US4124736A (en) * | 1974-10-29 | 1978-11-07 | Poly-Disc Systems, Inc. | Surface protected magnetic recording members |
| DE2459541C3 (de) * | 1974-12-17 | 1978-08-31 | Basf Ag, 6700 Ludwigshafen | Verfahren zum Herstellen von Magnetschichten von Magnetspeicherplatten |
| US4154875A (en) * | 1975-07-01 | 1979-05-15 | Nippon Electric Co., Ltd. | Process for manufacturing a magnetic record member |
| JPS5255603A (en) * | 1975-10-31 | 1977-05-07 | Nec Corp | Magnetic memory element and production of same |
| US4188434A (en) * | 1978-05-15 | 1980-02-12 | Storage Technology Corporation | Lubricant for a magnetic member |
-
1978
- 1978-12-19 JP JP16084278A patent/JPS5584045A/ja active Granted
-
1979
- 1979-12-05 DE DE2948845A patent/DE2948845C2/de not_active Expired
- 1979-12-12 US US06/102,731 patent/US4326229A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE2948845C2 (de) | 1982-12-09 |
| DE2948845A1 (de) | 1980-07-10 |
| JPS5584045A (en) | 1980-06-24 |
| US4326229A (en) | 1982-04-20 |
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