US3730489A - Hard chrome plated vibrating board of an ultrasonic-wave washer - Google Patents
Hard chrome plated vibrating board of an ultrasonic-wave washer Download PDFInfo
- Publication number
- US3730489A US3730489A US00236070A US3730489DA US3730489A US 3730489 A US3730489 A US 3730489A US 00236070 A US00236070 A US 00236070A US 3730489D A US3730489D A US 3730489DA US 3730489 A US3730489 A US 3730489A
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- US
- United States
- Prior art keywords
- board
- ultrasonic
- vibrating board
- vibrating
- tank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
Definitions
- This invention relates to a vibrating board for an illtrasonic-wave washer, and more particularly man improvement in a vibrating board attached to the bottom of a washing tank of the ultrasonic-wave washer especially usable for dish washing.
- an ultrasonic-wave washer In such an ultrasonic-wave washer, an ultrasonicwave is applied to a washing liquid in the tank through vibration of a vibrating board made of a stainless steel etc. to which a plurality of tremblers are attached from the back.
- a conventional ultrasonic-wave washer of the type an erosion which occurs on the vibrating board accompanying a strong ultrasonic-wave generated in the liquid can be hardly prevented at the present technical level in this field. The erosion has a tendency to give a larger damage to the board, the stronger the vibration is.
- the vibrating board is made of a 18-8 stainless steel for avoiding an erosion which, however, has sometimes a trouble of breakingthe tremblers during operation due to a difference in coefficients of thermal expansion between said 18-8 stainless steel and a ferrite forming the tremblers.
- a double coating of an aluminum plate over the under surface of the board or other measures have been adopted. It is most preferable to employ a titanium for the double coating, which, however, is extremely expensive.
- the erosion on the vibrating board is found to be a kind of evaporation of metals.
- a metal hard to evaporate is applied to the surface contacting the liquid, the advance of the erosion can be checked to a considerable extent.
- adhesion of foams to the contact face can be eliminated and a favorable contact with the liquid assuring a good transmission of the ultrasonic-wave can be obtained.
- the vibrating board should be thick enough to withstand the erosion. In this case, however, thethicker the board is, the more deterioration of the ultrasonicwave is observed.
- the stainless steel employed for the vibrating board has a large flexural rigidity in its property which makes it impossible to transmit a reliable vibration to the washing liquid when the vibrating board is made' thick enough to prevent the erosion.
- the vibrating board easily yields to erosion.
- an object of the present invention to provide a vibrating board for an ultrasonic-wave washer which is superior in its erosion resisting property and free from damages in tremblers, since the vibrating board has little difference in a coefficient of thermal expansion from the tremblers made of a ferrite.
- a vibrating board for an ultrasonic-wave washer fitted to an opening formed in the bottom of a washing tank and comprising a table portion protruding in said tank and carrying a plurality of tremblers thereunder, a surface of said table portion contacting a washing liquid in said tank being plated with a hard chrome; and a flange portion integrally formed with said table portion and fixed to the bottom of the tank.
- a vibrating board 2 of 18-8 stainless steel is attached to the washing tank from outside in such a manner that a table portion 2a of the vibrating board 2 protrudes in said tank 1 through said opening 1b.
- Said vibrating board 2 is fixed to the bottom la of the washing tank 1 by way of its flange portion 2b, through a packing member 3 provided therebetween, with bolts and nuts 4.
- Tremblers 5 are fixed to the under surface of the table portion 2a of the vibrating board 2.
- the vibrating board 2 consists of a base plate 21 of l88 stainless steel and a plated layer 22 of a hard chrome in the thickness of 20 30 t.
- the vibrating board may preferably be made of a thick material.
- the stainless steel employed for the vibrating board has a large flexural rigidity in its property which makes it impossible to transmit a reliable vibration to the washing liquid, when the material is made rather thick. This problem can be settled by making at least the four corners of the table portion 2a and theflange portion 2b thinner than the central area of the table portion as illustrated in FIGS.
- the four comers of the table 2a and the flange portion 2b of the vibrating board 2 are planed thinner prior to pressing so as to be about onetion 2a is preferably 1.2 1.6 mm though it varies depending on'the capacity of the washer and the number of the tremblers.
- the entire circumference of the table portion 2a except the central area and the entire flange portion 2b may be formed thinner.
- a step is made in the vibrating board 2 to form the table portion 2a and the flange portion 2b in the process of pressing.
- the present vibrating board with at'least the four comers of the table portion and the flange portion thereof planed thinner than the central area of the table portion 2a to which the tremblers 5 are attached can offer a powerful sound field in the liquid in the washing tank and, at the same time, can eliminate a breakdown by erosion, since the substantial portion of the board is formed thick. If two washing tanks having the same capacity but provided with different vibrating board, namely, the conventional one and the present one are operated employing the same ultrasonic-wave oscillator, the present vibrating board can produce far stronger sound field than the conventional board. Therefore, in order to produce a determined sound field, the output power of the oscillator can be smaller in combination with the present vibrating board advantageously from the economical point of view.
- the vibrating board for an ultrasonic-wave washer has various advantages that the plating of a hard chrome over the surface thereof can highly elevate an erosion resisting property of 18-8 stainless steel and eliminate damages in tremblers since a stainless steel plated with a hard chrome has little difference in a coefficient of thermal expansion from the tremblers made of a ferrite. Moreover, the surface of the vibrating board is formed so smoothly with a hard chrome plating that a favorable transmission of the ultrasonic-wave-can be assured.
- a vibrating board for an ultrasonic-wave washer fitted to an opening formed in the bottom of a washing tank and comprising a table portion protruding in said tank and carrying a plurality of tremblers thereunder, a surface of said table portion contacting a washing liquid in said tank being plated with a hard chrome; and a flange portion integrally formed with said table portion and fixed to the bottom of the tank.
- a vibrating board for a ultrasonic-wave washer as claimed in claim 1, wherein the thickness of the finished plating layer of the hard chrome is about 20 30 u.
Abstract
A vibrating board for an ultrasonic-wave washer fitted to an opening formed in the bottom of a washing tank to form a vibrating bottom of said tank with a plurality of tremblers fixed thereto at its under surface of the board which contacts a washing liquid in said tank is plated with a hard chrome. Moreover, at least four corners of the vibrating board are formed thinner than the substantial central area of the board to which the tremblers are attached from the below. Such construction of the vibrating board can avoid an erosion on the board, eliminated a breakdown of the tremblers and ensure a reliable transmission of an ultrasonic-wave to the liquid, and thus prolongs the durable years of the vibrating board.
Description
United States Patent 1 1 1 3,730,439 Morita May 1, 1973 1541 HARD CHROME PLATED VIBRATING 2,950,839 8/1960 Hahn ..220/64 BOARD OF AN T A W 3,058,014 10/1962 Camp..... ....259/DIG. 44 WASHER 3,l98,489 8/1965 Finch ..259/DIG. 44 [75] Inventor: Katsumi Morita, Higashikatsushika- P i E i william I, Pri
gun, Japan I g v Assistant ExaminerPhilip R. Coe [73] Assigneez Hakamada K-inzoku Kogyo Attorney-Shles1nger, Fltzsnnmons & Shlesmger Kabushiki Kaisha, Edogawa-ku, 57] ABSTRACT Tokyo, Japan 7 A vibrating board for an ultrasonic-wave washer fitted [22 1 Filed M 1972 to an opening formed in the bottom of a-washing tank [21] Appl. N0.: 236,070 to form a vibrating bottom of said tank with a plurality of tremblers fixed thereto at its under'surface of the board which contacts a washing liquid in said tank is [52] Cl. ..259/72, 68/3 SS, 134/1, plated with a hard chronm Moreover at least four 134/ i84, 259/DIG. 44, 310/83, 310/ corners of the vibrating board are formed thinner than [51] Int. Cl. ..B0lf 11/02 v the Substantial central area of the board to which the [58] Field of Search.. ...259/DIG. 44, l R, "emblemare attachgd f the below.
' 310/83, 26 Such construction of the vlbratmg board can avold an erosion on the board, eliminated a breakdown of the tr'emblers and ensure a reliable transmission of an ul- [56] Cited trasonic-wave to the liquid, and thus prolongs the UNITED STATES PATENTS durable years' of the vibrating board. 2,815,193 12/1957 Brown m ..68/3 ss x I 4 Claims, 4 Drawing Figures HARD CHROME PLATED VIBRATING BOARD OF AN ULTRASONIC-WAVE WASHER This invention relates to a vibrating board for an illtrasonic-wave washer, and more particularly man improvement in a vibrating board attached to the bottom of a washing tank of the ultrasonic-wave washer especially usable for dish washing.
In such an ultrasonic-wave washer, an ultrasonicwave is applied to a washing liquid in the tank through vibration of a vibrating board made of a stainless steel etc. to which a plurality of tremblers are attached from the back. In a conventional ultrasonic-wave washer of the type, an erosion which occurs on the vibrating board accompanying a strong ultrasonic-wave generated in the liquid can be hardly prevented at the present technical level in this field. The erosion has a tendency to give a larger damage to the board, the stronger the vibration is.
Usually, the vibrating board is made of a 18-8 stainless steel for avoiding an erosion which, however, has sometimes a trouble of breakingthe tremblers during operation due to a difference in coefficients of thermal expansion between said 18-8 stainless steel and a ferrite forming the tremblers. Heretofore, in order to solve the problem, a double coating of an aluminum plate over the under surface of the board or other measures have been adopted. It is most preferable to employ a titanium for the double coating, which, however, is extremely expensive.
In analysis, the erosion on the vibrating board is found to be a kind of evaporation of metals. When a metal hard to evaporate is applied to the surface contacting the liquid, the advance of the erosion can be checked to a considerable extent. Further, if the contact face is uniformly made as smoothly as a mirrorface, adhesion of foams to the contact face can be eliminated and a favorable contact with the liquid assuring a good transmission of the ultrasonic-wave can be obtained.
For further overcoming the erosion, there is an idea that the vibrating board should be thick enough to withstand the erosion. In this case, however, thethicker the board is, the more deterioration of the ultrasonicwave is observed. The stainless steel employed for the vibrating board has a large flexural rigidity in its property which makes it impossible to transmit a reliable vibration to the washing liquid when the vibrating board is made' thick enough to prevent the erosion. On the other hand, when the board is made thinner, the vibrating board easily yields to erosion.
It is, therefore, an object of the present invention to provide a vibrating board for an ultrasonic-wave washer which is superior in its erosion resisting property and free from damages in tremblers, since the vibrating board has little difference in a coefficient of thermal expansion from the tremblers made of a ferrite.
It is another object of the present invention to provide a vibrating board for an ultrasonic-wave washer which can transmit a vibration of the vibrating board uniformly and effectively to a washing liquid and overcome a flexural rigidity of the board, even though employing a thick material enough to withstand the erosion.
Essentially according to the present invention, there is provided a vibrating board for an ultrasonic-wave washer fitted to an opening formed in the bottom of a washing tank and comprising a table portion protruding in said tank and carrying a plurality of tremblers thereunder, a surface of said table portion contacting a washing liquid in said tank being plated with a hard chrome; and a flange portion integrally formed with said table portion and fixed to the bottom of the tank.
Various, further, specific objects, features and advantages of this invention will be described by way of example with reference to the accompanying drawings illustrating a preferred embodiment of this invention, in-- opening lb in its bottom 1a. A vibrating board 2 of 18-8 stainless steel is attached to the washing tank from outside in such a manner that a table portion 2a of the vibrating board 2 protrudes in said tank 1 through said opening 1b. Said vibrating board 2 is fixed to the bottom la of the washing tank 1 by way of its flange portion 2b, through a packing member 3 provided therebetween, with bolts and nuts 4.
Tremblers 5 are fixed to the under surface of the table portion 2a of the vibrating board 2.
As shown in FIG. 2, the vibrating board 2 consists of a base plate 21 of l88 stainless steel and a plated layer 22 of a hard chrome in the thickness of 20 30 t.
Further in order to overcome a trouble of erosion, the vibrating board may preferably be made of a thick material. However, as stated hereinbefore, the stainless steel employed for the vibrating board has a large flexural rigidity in its property which makes it impossible to transmit a reliable vibration to the washing liquid, when the material is made rather thick. This problem can be settled by making at least the four corners of the table portion 2a and theflange portion 2b thinner than the central area of the table portion as illustrated in FIGS.
3 and 4. In this case, the four comers of the table 2a and the flange portion 2b of the vibrating board 2 are planed thinner prior to pressing so as to be about onetion 2a is preferably 1.2 1.6 mm though it varies depending on'the capacity of the washer and the number of the tremblers. Alternatively, the entire circumference of the table portion 2a except the central area and the entire flange portion 2b may be formed thinner.
After planing is completed, a step is made in the vibrating board 2 to form the table portion 2a and the flange portion 2b in the process of pressing.
The present vibrating board with at'least the four comers of the table portion and the flange portion thereof planed thinner than the central area of the table portion 2a to which the tremblers 5 are attached can offer a powerful sound field in the liquid in the washing tank and, at the same time, can eliminate a breakdown by erosion, since the substantial portion of the board is formed thick. If two washing tanks having the same capacity but provided with different vibrating board, namely, the conventional one and the present one are operated employing the same ultrasonic-wave oscillator, the present vibrating board can produce far stronger sound field than the conventional board. Therefore, in order to produce a determined sound field, the output power of the oscillator can be smaller in combination with the present vibrating board advantageously from the economical point of view.
As set forth hereinabove, the vibrating board for an ultrasonic-wave washer according to this invention has various advantages that the plating of a hard chrome over the surface thereof can highly elevate an erosion resisting property of 18-8 stainless steel and eliminate damages in tremblers since a stainless steel plated with a hard chrome has little difference in a coefficient of thermal expansion from the tremblers made of a ferrite. Moreover, the surface of the vibrating board is formed so smoothly with a hard chrome plating that a favorable transmission of the ultrasonic-wave-can be assured.
Further advantages of the present invention are that span of life and that, notwithstanding, the present vibrating board can offer a powerful sound field in the tank with its thinner circumferential area.
. What is claimed is:
1. A vibrating board for an ultrasonic-wave washer fitted to an opening formed in the bottom of a washing tank and comprising a table portion protruding in said tank and carrying a plurality of tremblers thereunder, a surface of said table portion contacting a washing liquid in said tank being plated with a hard chrome; and a flange portion integrally formed with said table portion and fixed to the bottom of the tank.
2. A vibrating board for a ultrasonic-wave washer. as claimed in claim 1, wherein the thickness of the finished plating layer of the hard chrome is about 20 30 u.
3. A vibrating board for an ultrasonic-wave washer as claimed in claim 1, wherein at least four corners of the table portion and the flange portion are formed thinner than a central area of the table portion carrying the tremblers thereunder.
4. A vibrating board for an ultrasonic-washer as claimed in claim 3, wherein the thickness of the thinner area is about three-fourth of that of the thicker area.
Claims (4)
1. A vibrating board for an ultrasonic-wave washer fitted to an opening formed in the bottom of a washing tank and comprising a table portion protruding in said tank and carrying a plurality of tremblers thereunder, a surface of said table portion contacting a washing liquid in said tank being plated with a hard chrome; and a flange portion integrally formed with said table portion and fixed to the bottom of the tank.
2. A vibrating board for a ultrasonic-wave washer as claimed in claim 1, wherein the thickness of the finished plating layer of the hard chrome is about 20 - 30 Mu .
3. A vibrating board for an ultrasonic-wave washer as claimed in claim 1, wherein at least four corners of the table portion and the flange portion are formed thinner than a central area of the table portion carrying the tremblers thereunder.
4. A vibrating board for an ultrasonic-washer as claimed in claim 3, wherein the thickness of the thinner area is about three-fourth of that of the thicker area.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23607072A | 1972-03-20 | 1972-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3730489A true US3730489A (en) | 1973-05-01 |
Family
ID=22888014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00236070A Expired - Lifetime US3730489A (en) | 1972-03-20 | 1972-03-20 | Hard chrome plated vibrating board of an ultrasonic-wave washer |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3730489A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969208A (en) * | 1973-04-13 | 1976-07-13 | The Fujikura Cable Works, Ltd. | Ultrasonic apparatus |
| US4107994A (en) * | 1975-07-21 | 1978-08-22 | Sanko Air Plant Ltd. | Level detector |
| US4194922A (en) * | 1977-04-18 | 1980-03-25 | Rederiaktiebolaget Nordstjernan | Method and apparatus for ultrasonic cleaning of component parts |
| US4793973A (en) * | 1985-07-08 | 1988-12-27 | Serono Diagnostic Partners | Container for adding antibodies or antigens to a biological liquid |
| US4869278A (en) * | 1987-04-29 | 1989-09-26 | Bran Mario E | Megasonic cleaning apparatus |
| US4998549A (en) * | 1987-04-29 | 1991-03-12 | Verteq, Inc. | Megasonic cleaning apparatus |
| DE3933519A1 (en) * | 1989-10-05 | 1991-04-18 | Bandelin Electronic Gmbh & Co | Ultrasonic cleaner with tub for cleaning liq. - has ultrasonic oscillator(s) surrounded by ring, concentrically secured to plate |
| US5037481A (en) * | 1987-04-29 | 1991-08-06 | Verteq, Inc. | Megasonic cleaning method |
| US5119840A (en) * | 1986-04-07 | 1992-06-09 | Kaijo Kenki Co., Ltd. | Ultrasonic oscillating device and ultrasonic washing apparatus using the same |
| US5361914A (en) * | 1993-10-05 | 1994-11-08 | Digital Equipment Corporation | Device for component processing |
| US5722444A (en) * | 1996-03-26 | 1998-03-03 | Trident Technologies Unlimited, Inc. | Rigid ultrasonic radiation plate assembly systems for ultrasonic cleaning tanks |
| US20080095667A1 (en) * | 2004-09-22 | 2008-04-24 | Miyuki Murakami | Agitation Apparatus, Vessel, And Analysis Apparatus Including Agitation Apparatus |
| EP2138983A2 (en) | 2008-06-26 | 2009-12-30 | Steven Michael Faes | Article storage and retrieval apparatus and vending machine |
| US20100077547A1 (en) * | 2008-09-26 | 2010-04-01 | Tortorella Nathan F | Stainless Steel Plumbing Fixtures With Resistant Coatings |
| WO2021165121A1 (en) * | 2020-02-21 | 2021-08-26 | Weber Ultrasonics AG | Ultrasonic surface vibrator for textile finishing, textile finishing device and textile finishing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2815193A (en) * | 1954-01-25 | 1957-12-03 | Bendix Aviat Corp | Ultrasonic cleaning system |
| US2950839A (en) * | 1958-11-17 | 1960-08-30 | Lyon Inc | Chromium plated baking pans |
| US3058014A (en) * | 1958-09-08 | 1962-10-09 | Bendix Corp | Apparatus for generating sonic vibrations in liquids |
| US3198489A (en) * | 1962-02-16 | 1965-08-03 | Birtcher Corp | Compound ultrasonic transducer and mounting means therefor |
-
1972
- 1972-03-20 US US00236070A patent/US3730489A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2815193A (en) * | 1954-01-25 | 1957-12-03 | Bendix Aviat Corp | Ultrasonic cleaning system |
| US3058014A (en) * | 1958-09-08 | 1962-10-09 | Bendix Corp | Apparatus for generating sonic vibrations in liquids |
| US2950839A (en) * | 1958-11-17 | 1960-08-30 | Lyon Inc | Chromium plated baking pans |
| US3198489A (en) * | 1962-02-16 | 1965-08-03 | Birtcher Corp | Compound ultrasonic transducer and mounting means therefor |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969208A (en) * | 1973-04-13 | 1976-07-13 | The Fujikura Cable Works, Ltd. | Ultrasonic apparatus |
| US4107994A (en) * | 1975-07-21 | 1978-08-22 | Sanko Air Plant Ltd. | Level detector |
| US4194922A (en) * | 1977-04-18 | 1980-03-25 | Rederiaktiebolaget Nordstjernan | Method and apparatus for ultrasonic cleaning of component parts |
| US4793973A (en) * | 1985-07-08 | 1988-12-27 | Serono Diagnostic Partners | Container for adding antibodies or antigens to a biological liquid |
| US5119840A (en) * | 1986-04-07 | 1992-06-09 | Kaijo Kenki Co., Ltd. | Ultrasonic oscillating device and ultrasonic washing apparatus using the same |
| US5203362A (en) * | 1986-04-07 | 1993-04-20 | Kaijo Denki Co., Ltd. | Ultrasonic oscillating device and ultrasonic washing apparatus using the same |
| US4869278A (en) * | 1987-04-29 | 1989-09-26 | Bran Mario E | Megasonic cleaning apparatus |
| US5037481A (en) * | 1987-04-29 | 1991-08-06 | Verteq, Inc. | Megasonic cleaning method |
| US4998549A (en) * | 1987-04-29 | 1991-03-12 | Verteq, Inc. | Megasonic cleaning apparatus |
| DE3933519A1 (en) * | 1989-10-05 | 1991-04-18 | Bandelin Electronic Gmbh & Co | Ultrasonic cleaner with tub for cleaning liq. - has ultrasonic oscillator(s) surrounded by ring, concentrically secured to plate |
| US5361914A (en) * | 1993-10-05 | 1994-11-08 | Digital Equipment Corporation | Device for component processing |
| US5722444A (en) * | 1996-03-26 | 1998-03-03 | Trident Technologies Unlimited, Inc. | Rigid ultrasonic radiation plate assembly systems for ultrasonic cleaning tanks |
| US20080095667A1 (en) * | 2004-09-22 | 2008-04-24 | Miyuki Murakami | Agitation Apparatus, Vessel, And Analysis Apparatus Including Agitation Apparatus |
| US8430555B2 (en) * | 2004-09-22 | 2013-04-30 | Beckman Coulter, Inc. | Agitation apparatus, vessel, and analysis apparatus including agitation apparatus |
| EP2138983A2 (en) | 2008-06-26 | 2009-12-30 | Steven Michael Faes | Article storage and retrieval apparatus and vending machine |
| US20100077547A1 (en) * | 2008-09-26 | 2010-04-01 | Tortorella Nathan F | Stainless Steel Plumbing Fixtures With Resistant Coatings |
| US8763173B2 (en) | 2008-09-26 | 2014-07-01 | Kohler Co. | Stainless steel plumbing fixtures with resistant coatings |
| WO2021165121A1 (en) * | 2020-02-21 | 2021-08-26 | Weber Ultrasonics AG | Ultrasonic surface vibrator for textile finishing, textile finishing device and textile finishing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: YOTO KABUSHIKI KAISHA Free format text: CHANGE OF NAME;ASSIGNOR:HAKAMADA KINZOKU KOGYO KABUSHIKI KAISHA;REEL/FRAME:003883/0004 Effective date: 19810409 |
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| AS | Assignment |
Owner name: KABUSHIKI KAISHA UENO SEISAKUSHO, TOKYO, JAPAN A J Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YOTO KABUSHIKI KAISHA BY HISATAKA HAKAMADA, PRES.;REEL/FRAME:003909/0732 Effective date: 19810630 Owner name: KABUSHIKI KAISHA UENO SEISAKUSHO, TOKYO, JAPAN A J Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:YOTO KABUSHIKI KAISHA BY HISATAKA HAKAMADA, PRES.;REEL/FRAME:003909/0732 Effective date: 19810630 |