GB1337228A - Layered photoconductive imaging member and method - Google Patents
Layered photoconductive imaging member and methodInfo
- Publication number
- GB1337228A GB1337228A GB528771A GB528771A GB1337228A GB 1337228 A GB1337228 A GB 1337228A GB 528771 A GB528771 A GB 528771A GB 528771 A GB528771 A GB 528771A GB 1337228 A GB1337228 A GB 1337228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- layer
- pyrene
- coating
- conductive layer
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0622—Heterocyclic compounds
- G03G5/0624—Heterocyclic compounds containing one hetero ring
- G03G5/0627—Heterocyclic compounds containing one hetero ring being five-membered
- G03G5/0629—Heterocyclic compounds containing one hetero ring being five-membered containing one hetero atom
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G5/0528—Macromolecular bonding materials
- G03G5/0532—Macromolecular bonding materials obtained by reactions only involving carbon-to-carbon unsatured bonds
- G03G5/0535—Polyolefins; Polystyrenes; Waxes
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G5/0528—Macromolecular bonding materials
- G03G5/0532—Macromolecular bonding materials obtained by reactions only involving carbon-to-carbon unsatured bonds
- G03G5/0546—Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0601—Acyclic or carbocyclic compounds
- G03G5/0605—Carbocyclic compounds
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0601—Acyclic or carbocyclic compounds
- G03G5/0605—Carbocyclic compounds
- G03G5/0607—Carbocyclic compounds containing at least one non-six-membered ring
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0601—Acyclic or carbocyclic compounds
- G03G5/0609—Acyclic or carbocyclic compounds containing oxygen
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/08—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic
- G03G5/087—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic and being incorporated in an organic bonding material
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/09—Sensitisors or activators, e.g. dyestuffs
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Coating Apparatus (AREA)
- Photoreceptors In Electrophotography (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Light Receiving Elements (AREA)
Abstract
1337228 Electro-photographic element XEROX CORP 24 Feb 1971 5287/71 HeadingsG2C C17C5 C17D1 and C17D2 An imaging member comprises a layer of photo-conductive material and a contiguous layer of an electrically active organic material, the photo-conductive layer being capable of generating holes in excitation by actinic radiation and the active material being capable of supporting hole injection from the photo-conductive layer and transporting the holes. In the specific embodiments the member is provided with a support of aluminium optionally coated with a blocking layer of nylon or epoxy resin and the photo-conductive layer is formed by vapour deposition of Se, or coating with an organic solvent solution of polyvinyl carbazole and selenium, a quinacridone, a polynuclear aromatic quinone or X-form metal-free phthalocyanine. The layer of active material may be a coating of polyvinyl carbazole, polyvinyl pyrene, a pyreneformaldehyde condensation polymer or a polymer of pyrene and acrylic acid, or vacuum coating of pyrene, tetraphene, 1-acetylpyrene, 2, 3-benzochrysene, 6, 7-benzo-pyrene, 1-bromopyrene, carbazole, 1-ethylpyrene, 1-methylpyrene, perylene and 2-phenylindole. Many other suitable substrates, photo-conductors and active materials are specified.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE763541A BE763541A (en) | 1971-02-26 | 1971-02-26 | BINDING MEMBER AND IMAGE FORMATION METHOD. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1337228A true GB1337228A (en) | 1973-11-14 |
Family
ID=3857785
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB528671A Expired GB1343671A (en) | 1971-02-26 | 1971-02-24 | Photoconductive imaging member |
GB528771A Expired GB1337228A (en) | 1971-02-26 | 1971-02-24 | Layered photoconductive imaging member and method |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB528671A Expired GB1343671A (en) | 1971-02-26 | 1971-02-24 | Photoconductive imaging member |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5853943B2 (en) |
BE (1) | BE763541A (en) |
CH (1) | CH567744A5 (en) |
DE (1) | DE2108939B2 (en) |
FR (1) | FR2127347A5 (en) |
GB (2) | GB1343671A (en) |
NL (1) | NL171385C (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4135928A (en) * | 1976-10-23 | 1979-01-23 | Ricoh Co., Ltd. | Electrophotographic light-sensitive member |
US4141729A (en) * | 1976-05-18 | 1979-02-27 | Ricoh Company, Ltd. | 1,3,4-Oxadiazole derivatives and electrophotographic plates containing same |
US4192677A (en) * | 1976-05-18 | 1980-03-11 | Ricoh Co., Ltd. | 1,3,4-Oxadiazole derivatives and use thereof |
US4209327A (en) * | 1977-10-20 | 1980-06-24 | Ricoh Co., Ltd. | Electrophotographic sensitive element with benzylamino carbazole charge transfer material |
US4232103A (en) * | 1979-08-27 | 1980-11-04 | Xerox Corporation | Phenyl benzotriazole stabilized photosensitive device |
US4304829A (en) * | 1977-09-22 | 1981-12-08 | Xerox Corporation | Imaging system with amino substituted phenyl methane charge transport layer |
DE3148967A1 (en) * | 1980-12-10 | 1982-08-05 | Ricoh Co., Ltd., Tokyo | Electrophotographic method |
US4349617A (en) * | 1979-10-23 | 1982-09-14 | Fuji Photo Film Co., Ltd. | Function separated type electrophotographic light-sensitive members and process for production thereof |
US4362798A (en) * | 1981-05-18 | 1982-12-07 | International Business Machines Corporation | Hydrazone and pyrazoline or acetosol yellow containing charge transport layer, photoconductor and electrophotographic process using the same |
JPS5811947A (en) * | 1981-07-15 | 1983-01-22 | Fuji Photo Film Co Ltd | Electrophotographic receptor |
US4451545A (en) * | 1981-10-03 | 1984-05-29 | Ricoh Co., Ltd. | Electrophotographic element with carbazole derivative |
US4477547A (en) * | 1982-01-07 | 1984-10-16 | Mitsubishi Paper Mills, Ltd. | Method for making complex layer type lithografic printing plate |
US4481270A (en) * | 1983-04-28 | 1984-11-06 | Ricoh Systems, Inc. | Photoreceptor containing squaric acid methine dyes |
US4524118A (en) * | 1982-06-25 | 1985-06-18 | Mita Industrial Co., Ltd. | Electrophotographic photosensitive material with ozone inhibitor |
US4632892A (en) * | 1983-11-01 | 1986-12-30 | Canon Kabushiki Kaisha | Photosensitive member with resin having low oligomer content in charge transport layer |
US4818654A (en) * | 1984-02-10 | 1989-04-04 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member with combination of polymethyl methacrylate resins |
MD4570B1 (en) * | 2016-05-10 | 2018-05-31 | Государственный Университет Молд0 | Carbazole copolymer-based photosensitive layer |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4097277A (en) * | 1973-01-31 | 1978-06-27 | Canon Kabushiki Kaisha | Photosensitive member having layer of vinyl carbazole polymer containing antimony chalcogen compound of antimony and sulfur |
US4050935A (en) * | 1976-04-02 | 1977-09-27 | Xerox Corporation | Trigonal Se layer overcoated by bis(4-diethylamino-2-methylphenyl)phenylmethane containing polycarbonate |
JPS6058467B2 (en) * | 1977-10-22 | 1985-12-20 | 株式会社リコー | Electrophotographic photoreceptor |
US4500621A (en) * | 1983-04-11 | 1985-02-19 | Ricoh Systems, Inc. | Sensitive electrophotographic plates containing squaric acid methine dyes suspended in a binder |
GB8314918D0 (en) * | 1983-05-31 | 1983-07-06 | Vickers Plc | Radiation sensitive compositions |
JPS6035780U (en) * | 1983-08-20 | 1985-03-12 | ナショナル住宅産業株式会社 | Coating device |
JPH05293411A (en) * | 1992-04-20 | 1993-11-09 | Tomoegawa Paper Co Ltd | Paint coating method and apparatus |
KR20020031782A (en) * | 2000-10-24 | 2002-05-03 | 박형용 | Automatic knife return device for thin film coating device |
KR20020031780A (en) * | 2000-10-24 | 2002-05-03 | 박형용 | Release paper junction detector for automatic thin film coating device |
-
1971
- 1971-02-24 GB GB528671A patent/GB1343671A/en not_active Expired
- 1971-02-24 GB GB528771A patent/GB1337228A/en not_active Expired
- 1971-02-25 DE DE19712108939 patent/DE2108939B2/en not_active Ceased
- 1971-02-25 FR FR7107559A patent/FR2127347A5/fr not_active Expired
- 1971-02-25 CH CH277271A patent/CH567744A5/xx not_active IP Right Cessation
- 1971-02-26 NL NL7102641A patent/NL171385C/en not_active IP Right Cessation
- 1971-02-26 BE BE763541A patent/BE763541A/en not_active IP Right Cessation
-
1979
- 1979-07-25 JP JP9524079A patent/JPS5853943B2/en not_active Expired
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4141729A (en) * | 1976-05-18 | 1979-02-27 | Ricoh Company, Ltd. | 1,3,4-Oxadiazole derivatives and electrophotographic plates containing same |
US4192677A (en) * | 1976-05-18 | 1980-03-11 | Ricoh Co., Ltd. | 1,3,4-Oxadiazole derivatives and use thereof |
US4135928A (en) * | 1976-10-23 | 1979-01-23 | Ricoh Co., Ltd. | Electrophotographic light-sensitive member |
US4304829A (en) * | 1977-09-22 | 1981-12-08 | Xerox Corporation | Imaging system with amino substituted phenyl methane charge transport layer |
US4209327A (en) * | 1977-10-20 | 1980-06-24 | Ricoh Co., Ltd. | Electrophotographic sensitive element with benzylamino carbazole charge transfer material |
US4232103A (en) * | 1979-08-27 | 1980-11-04 | Xerox Corporation | Phenyl benzotriazole stabilized photosensitive device |
US4349617A (en) * | 1979-10-23 | 1982-09-14 | Fuji Photo Film Co., Ltd. | Function separated type electrophotographic light-sensitive members and process for production thereof |
DE3148967C2 (en) | 1980-12-10 | 1984-11-29 | Ricoh Co., Ltd., Tokio/Tokyo | Electrophotographic recording process |
DE3148967A1 (en) * | 1980-12-10 | 1982-08-05 | Ricoh Co., Ltd., Tokyo | Electrophotographic method |
US4362798A (en) * | 1981-05-18 | 1982-12-07 | International Business Machines Corporation | Hydrazone and pyrazoline or acetosol yellow containing charge transport layer, photoconductor and electrophotographic process using the same |
US4594303A (en) * | 1981-07-15 | 1986-06-10 | Fuji Photo Film Co., Ltd. | Electrophotographic photoreceptor |
JPS5811947A (en) * | 1981-07-15 | 1983-01-22 | Fuji Photo Film Co Ltd | Electrophotographic receptor |
JPH0225503B2 (en) * | 1981-07-15 | 1990-06-04 | Fuji Photo Film Co Ltd | |
US4451545A (en) * | 1981-10-03 | 1984-05-29 | Ricoh Co., Ltd. | Electrophotographic element with carbazole derivative |
US4477547A (en) * | 1982-01-07 | 1984-10-16 | Mitsubishi Paper Mills, Ltd. | Method for making complex layer type lithografic printing plate |
US4524118A (en) * | 1982-06-25 | 1985-06-18 | Mita Industrial Co., Ltd. | Electrophotographic photosensitive material with ozone inhibitor |
US4481270A (en) * | 1983-04-28 | 1984-11-06 | Ricoh Systems, Inc. | Photoreceptor containing squaric acid methine dyes |
US4632892A (en) * | 1983-11-01 | 1986-12-30 | Canon Kabushiki Kaisha | Photosensitive member with resin having low oligomer content in charge transport layer |
US4818654A (en) * | 1984-02-10 | 1989-04-04 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member with combination of polymethyl methacrylate resins |
MD4570B1 (en) * | 2016-05-10 | 2018-05-31 | Государственный Университет Молд0 | Carbazole copolymer-based photosensitive layer |
Also Published As
Publication number | Publication date |
---|---|
DE2108939B2 (en) | 1978-06-01 |
DE2108939A1 (en) | 1972-09-14 |
CH567744A5 (en) | 1975-10-15 |
NL7102641A (en) | 1972-08-29 |
NL171385C (en) | 1983-03-16 |
NL171385B (en) | 1982-10-18 |
GB1343671A (en) | 1974-01-16 |
FR2127347A5 (en) | 1972-10-13 |
JPS5617657A (en) | 1981-02-19 |
BE763541A (en) | 1971-08-26 |
JPS5853943B2 (en) | 1983-12-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1337228A (en) | Layered photoconductive imaging member and method | |
US3877935A (en) | Novel xerographic plate containing photoinjecting polynuclear quinone pigments | |
US4921773A (en) | Process for preparing an electrophotographic imaging member | |
US3953207A (en) | Composite layered photoreceptor | |
US4123270A (en) | Method of making electrophotographic imaging element | |
US3870516A (en) | Method of imaging photoconductor in change transport binder | |
US3879200A (en) | Novel xerographic plate containing photoinjecting bis-benzimidazole pigments | |
US3850630A (en) | Xerographic plate containing photoinjection indigold pigments | |
US5667928A (en) | Dip coating method having intermediate bead drying step | |
US5350654A (en) | Photoconductors employing sensitized extrinsic photogenerating pigments | |
US5413886A (en) | Transport layers containing two or more charge transporting molecules | |
US6127077A (en) | Photoreceptors with delayed discharge | |
US4933244A (en) | Phenolic epoxy polymer or polyester and charge transporting small molecule at interface between a charge generator layer and a charge transport layer | |
US5342719A (en) | Imaging members having a hydroxy aryl amine charge transport layer | |
GB1337227A (en) | Xerographic electron transport structure | |
US5066557A (en) | Styrene butadiene copolymers as binders in mixed pigment generating layer | |
US4292385A (en) | Bi-modal photoreceptor and method | |
SU449515A3 (en) | Electrophotographic element | |
JPH0572759A (en) | Production of electrophotographic sensitive body | |
SU540581A3 (en) | Electrophotographic element | |
JP2001060011A (en) | Electrophotographic photoreceptor | |
JPH01307759A (en) | Electrophotographic sensitive body | |
JPH0774333A (en) | Image read device | |
JPH01285950A (en) | Electrophotographic sensitive body | |
JP2000035684A (en) | Production of electrophotographic photoreceptor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
433D | Application made for revocation (sect. 33/1949) | ||
433C | Case decided by the comptroller ** specification amended (sect. 33/1949) | ||
433L | Application made to the patents court (sect. 33/1949) | ||
729S | Offer to surrender (sect. 29/1977) | ||
433 | Proceeding terminated by voluntary surrender of the patent (sect. 33/1949) | ||
729A | Offer accepted by the comptroller (sect. 29/1977) |