US3921344A - Lens surfacing pads and method of making the same - Google Patents

Lens surfacing pads and method of making the same Download PDF

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Publication number
US3921344A
US3921344A US359825A US35982573A US3921344A US 3921344 A US3921344 A US 3921344A US 359825 A US359825 A US 359825A US 35982573 A US35982573 A US 35982573A US 3921344 A US3921344 A US 3921344A
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US
United States
Prior art keywords
sheet
film
lens
tool
foraminous
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
Application number
US359825A
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English (en)
Inventor
Bertram R Goodwin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Optical Corp
Original Assignee
American Optical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Optical Corp filed Critical American Optical Corp
Priority to US359825A priority Critical patent/US3921344A/en
Priority to CA198,746A priority patent/CA1010660A/en
Priority to GB2036474A priority patent/GB1436481A/en
Publication of USB359825I5 publication Critical patent/USB359825I5/en
Application granted granted Critical
Publication of US3921344A publication Critical patent/US3921344A/en
Assigned to AO,INC. A CORP OF DE. reassignment AO,INC. A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN OPTICAL CORPORATION
Assigned to WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP. reassignment WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP. CONDITIONAL ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: AO, INC. A DE CORP.
Assigned to WARNER-LAMBERT TECHNOLOGIES, INC., WARNER-LAMBERT CANADA, INC. reassignment WARNER-LAMBERT TECHNOLOGIES, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AO, INC., A DE CORP.
Assigned to IRVING TRUST COMPANY reassignment IRVING TRUST COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AO, INC.
Assigned to AMERICAN OPTICAL CORPORATION, A CORP. OF reassignment AMERICAN OPTICAL CORPORATION, A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AO, INC., A DE. CORP., IRVING TRUST COMPANY, A NY CORP., WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP.
Assigned to IRVING TRUST COMPANY reassignment IRVING TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN OPTICAL CORPORATION, RADIAC ABRASIVES (EAST) INC., RADIAC ABRASIVES (WEST) INC.
Assigned to RADIAC ABRASIVES (WEST) INC., RADIAC ABRASIVES (EAST) INC., AMERICAN OPTICAL CORPORATION reassignment RADIAC ABRASIVES (WEST) INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF NEW YORK, THE (FORMERLY KNOWN AS IRVING TRUST COMPANY)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance

Definitions

  • Lens surfacing pads with particular reference to disposable pads of foraminous material which are readily conformable and releasably attachable to lens surfacing tools.
  • Disposable foraminous lens surfacing pads of wire mesh, woven fibrous material or perforated sheet metal and other perforate materials which are generally readily conformable to curved working surfaces of conventional lens surfacing tools have, heretofore, been detachably applied to such tools with mechanical clamps or adhesives, the latter usually being in the form of a layer of pressure sensitive adhesive attached to one side of the foraminous pad.
  • US. Pat. Nos. 2,886,923 and 3,225,497 are exemplary.
  • the present invention contemplates the use of a tough, puncture resistant continuous or imperforate film on one side only of the foraminous pads for receiving the adhesive.
  • the film is applied with a non-hazardous laminating operation requiring no post curing or aging.
  • the opposite working sides of the pads are left bare for direct surface engagement with lenses to be abraded.
  • suitable conventional abrasive slurries are applied thereto in lens surfacing operations such are shown and dcscribed in US. Pat. Nos. 2.886.923 and 3,225,497.
  • the present invention offers the advantages of a fully exposed uncoated bare foraminous abradin g surface, adhesive attachment means and protection against interference of the adhesive with lens surfacing operations. Still further. the present invention avoids prior art hazards, tedious and expensive operations in the manufacture of the pads and the prior art necessity for large inventoriesrcsulting from curing and aging cycles having to last several weeks before readiness for sale and use of the pads.
  • Foraminous surfacing pads are produced according to the present invention from a sheet of woven wire. woven synthetic fibers or perforate sheet metal, plastic or other material by laminating to one side of the selected foraminous sheet material a thin film of a thermoplastic resin, e.g., of a type derived from polyethylene. which has a high resistance to abrasion and puncture.
  • the film is applied with a simple time-temperature-pressure cycle eliminating prior art hazardous manufacturing operations and lengthy curing cycles.
  • An adhesive preferably a double-faced pressure sensitive tape, is applied to the laminate for attaching pads cut therefrom to lens surfacing tools.
  • FIG. 1 is a plan view of a lens surfacing pad exemplifying a preferred embodiment of the present invention, portions of the pad being broken away to more clearly illustrate its structure;
  • FIG. 2 is a side elevational view of a lens surfacing tool having a surfacing pad of the type shown in FIG. 1 applied thereto as 21 facing for its working surface;
  • FIG. 3 is an enlarged fragmentary cross-sectional view of the lens surfacing tool of FIG. 2 showing a portion of a lens in abrading relationship therewith;
  • FIG. 4 is a diagrammatic illustration, partially in cross-section, of an apparatus and method used in the manufacture of lens surfacing pads acccording to the invention.
  • FIG. 5 is an enlarged fragmentary cross-sectional view of lens surfacing pad material of the type formed according to the invention.
  • Pad 10 which is intended for use as a facing for lens surfacing tools, e.g., tool 12 (FIGS. 2 and 3), comprises a laminate of a foraminous sheet 14 of woven wire. woven fibers or perforate sheet material having a thin film 16 of a thermoplastic resin affixed to its inner side and an adhesive 18, e.g., double-faced pressure sensitive tape, applied to film 16 for use in detachably securing pad 10 to tool 12. During storage. adhesive 18 is protected by a strip-off covering 20.
  • a preferred construction would comprise a foraminous sheet 14 of galvanized soft steel wire screening having approximately 30 X 30 strands per inch and a wire size of approximately 0.007 inch; a 0.002 to 0.004 inch thick film 16 of a thermoplastic resin derived from polyethylene such as. for example, the highly abrasion and puncture resistant commercially available film material currently known as Surlyn. a proprietary name applied by E. I. DuPont Dc Nemours and Co. one.) to'the film' material; an adhesive 18 of double-faced pressure sensitive tape: and a strip-off protective cover 20 of paper or a thin plastic material preferably having a glazed or release coated surface for ease of removal from adhesive 18.
  • foraminous sheet 14 may be formed of'w'ovenrhard plastic or natural fibers, perforated aluminum foil or other metallic andplastic sheet materi'als ofva'rious thicknesses.
  • pad 14 With protective covering 20 stripped away from pad 14, it is applied as a facing for tool 12 simply by press-' ing adhesive 18 against the working surface 22 of tool 12 (FIG. 3). In so doing, and with additional pressure applied to the pad 14 by a lens L being surfaced by tool 12 (FIG. 3), pad 14 will assume the curved shape of 1 surface 22 whether convex (as illustrated) or concave- (not illustrated).
  • Pad 14 is fabricated as follows:
  • a sheet 14' (FIG. 4) of a particular preselected type of foraminous material is placed flatly upona platen 28 and covered by a film 16' of the aforementioned 0.002 to 0.004 inch thickness of thermoplastic resin.
  • a pressure plate 30 is theii brought into place flatly against film 16' and pressure is applied to plate 30 uniformly over the extent of its coverage of film 16 while the film is heated by plate 30, e1g., with electrical heating coils 32 therewithin, for a period of time sufficient to attach film 16 to sheet 14' as a laminate.
  • An exemplary time-temperature-pressure cycle is approximately 1 minute at approximately 275 F witha pressure of approximately 4,000 pounds per square inch.
  • a protective barrier such as a silicone coated release paper 17. should be placed between a platen 30 and film l6.
  • a layer 18' of adhesive material e.g., a double-faced pressure sensitive tape having one side protected with a cover sheet 20 (FIG. '5) is applied to film 16.
  • Pads 14 of the circular shape illustrated in FIG. 1 or of other desired shapes aiid sizes are then punched or otherwise cut from the completed laminate l and are immediately ready for use.
  • a disposable lens surfacing pad comprising the laminate of:
  • a layer of adhesive on said film for detachably securing said pad to said rigid lens surfacing tool as a tool facing; whereby said film component of said laminate prevents the material of said adhesive from penetrating said sheet of foraminous material and contaminating a lens placed thereagainst under pressure for surfacing by said tool.
  • a lens surfacing tool comprising:
  • a rigid main bodyadaptable to lens surfacing machines one side of said body having a surfacecurvature substantially corresponding to a curvature desired to be produced upon a lens intended to be worked by said tool;
  • adisposablelens surfacing pad detachably secured to said surface of said tool as a facing
  • said pad comprising the laminate of a sheet of foraminous material, a thin, imperforate film of highly abrasive and puncture resistant material heat sealed to one side only of said sheet of foraminous material, the opposite side of said. sheet being fully exposed for direct contact with a lens to be surfaced and a layer of adhesive on said film fordetachably securing said pad to said surface of said tool as a tool facing whereby said film component of said laminate prevents the material of said adhesive from penetrating said sheet of foraminous material and contaminating a lens placed thereagainst under pressure for surfacing by said tool.
  • a lens surfacing tool according to claim 9 wherein said foraminous material is a perforate sheeting and said film of said highly abrasion and puncture resistant material is a thermoplastic resin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Adhesive Tapes (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US359825A 1973-05-14 1973-05-14 Lens surfacing pads and method of making the same Expired - Lifetime US3921344A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US359825A US3921344A (en) 1973-05-14 1973-05-14 Lens surfacing pads and method of making the same
CA198,746A CA1010660A (en) 1973-05-14 1974-05-02 Lens surfacing pads and method of making the same
GB2036474A GB1436481A (en) 1973-05-14 1974-05-08 Laminated lens surfacing pads and a method of making same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US359825A US3921344A (en) 1973-05-14 1973-05-14 Lens surfacing pads and method of making the same

Publications (2)

Publication Number Publication Date
USB359825I5 USB359825I5 (enrdf_load_stackoverflow) 1975-01-28
US3921344A true US3921344A (en) 1975-11-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US359825A Expired - Lifetime US3921344A (en) 1973-05-14 1973-05-14 Lens surfacing pads and method of making the same

Country Status (3)

Country Link
US (1) US3921344A (enrdf_load_stackoverflow)
CA (1) CA1010660A (enrdf_load_stackoverflow)
GB (1) GB1436481A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255164A (en) * 1979-04-30 1981-03-10 Minnesota Mining And Manufacturing Company Fining sheet and method of making and using the same
USRE31897E (en) * 1975-03-31 1985-05-28 Minnesota Mining And Manufacturing Company Method for the alteration of a lens
US4989316A (en) * 1987-03-09 1991-02-05 Gerber Scientific Products, Inc. Method and apparatus for making prescription eyeglass lenses
US5000761A (en) * 1988-10-26 1991-03-19 Ferro Corporation Gel producing pad and improved method for surfacing and polishing lenses
US6074290A (en) * 1994-10-28 2000-06-13 Minnesota Mining And Manufacturing Company Compliant lens block and tape
RU2223255C1 (ru) * 2003-02-04 2004-02-10 Открытое акционерное общество по производству взрывчатых материалов и пиротехники "Нитро-Взрыв" Пороховой взрывчатый состав
US20050150594A1 (en) * 2004-01-09 2005-07-14 Ichiro Kodaka Layered support and method for laminating CMP pads
US20090026752A1 (en) * 2007-02-01 2009-01-29 Mark Kucera Tabbed divider making apparatus and method
US20090270237A1 (en) * 2008-02-12 2009-10-29 Scott Office Systems Llc Customized tab machine

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085211A (en) * 1934-12-10 1937-06-29 Briggs Mfg Co Grinding disk and method of making the same
US2286208A (en) * 1940-12-03 1942-06-16 Carborundum Co Granular coated article and its manufacture
US2752738A (en) * 1953-09-04 1956-07-03 Donald W Kent Overlay for and method of grinding lens blanks
GB855436A (en) * 1958-07-09 1960-11-30 George Davies Abrasive or polishing elements
US3144737A (en) * 1962-09-27 1964-08-18 Bausch & Lomb Aluminum foil lens grinding pad
US3225497A (en) * 1962-10-19 1965-12-28 American Optical Corp Method and apparatus for forming a lens surface
US3522680A (en) * 1967-03-23 1970-08-04 George M J Sarofeen Expanded metal facing for a lens abrading tool
US3583111A (en) * 1966-08-22 1971-06-08 David Volk Lens grinding apparatus
US3699721A (en) * 1967-08-22 1972-10-24 Itek Corp Grinding pad
US3860400A (en) * 1971-07-27 1975-01-14 Prowse Co Ltd D H Flexible abrasive coverings

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085211A (en) * 1934-12-10 1937-06-29 Briggs Mfg Co Grinding disk and method of making the same
US2286208A (en) * 1940-12-03 1942-06-16 Carborundum Co Granular coated article and its manufacture
US2752738A (en) * 1953-09-04 1956-07-03 Donald W Kent Overlay for and method of grinding lens blanks
GB855436A (en) * 1958-07-09 1960-11-30 George Davies Abrasive or polishing elements
US3144737A (en) * 1962-09-27 1964-08-18 Bausch & Lomb Aluminum foil lens grinding pad
US3225497A (en) * 1962-10-19 1965-12-28 American Optical Corp Method and apparatus for forming a lens surface
US3583111A (en) * 1966-08-22 1971-06-08 David Volk Lens grinding apparatus
US3522680A (en) * 1967-03-23 1970-08-04 George M J Sarofeen Expanded metal facing for a lens abrading tool
US3699721A (en) * 1967-08-22 1972-10-24 Itek Corp Grinding pad
US3860400A (en) * 1971-07-27 1975-01-14 Prowse Co Ltd D H Flexible abrasive coverings

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31897E (en) * 1975-03-31 1985-05-28 Minnesota Mining And Manufacturing Company Method for the alteration of a lens
US4255164A (en) * 1979-04-30 1981-03-10 Minnesota Mining And Manufacturing Company Fining sheet and method of making and using the same
US4989316A (en) * 1987-03-09 1991-02-05 Gerber Scientific Products, Inc. Method and apparatus for making prescription eyeglass lenses
US5000761A (en) * 1988-10-26 1991-03-19 Ferro Corporation Gel producing pad and improved method for surfacing and polishing lenses
US6074290A (en) * 1994-10-28 2000-06-13 Minnesota Mining And Manufacturing Company Compliant lens block and tape
RU2223255C1 (ru) * 2003-02-04 2004-02-10 Открытое акционерное общество по производству взрывчатых материалов и пиротехники "Нитро-Взрыв" Пороховой взрывчатый состав
US20050150594A1 (en) * 2004-01-09 2005-07-14 Ichiro Kodaka Layered support and method for laminating CMP pads
US7160413B2 (en) 2004-01-09 2007-01-09 Mipox International Corporation Layered support and method for laminating CMP pads
US20090026752A1 (en) * 2007-02-01 2009-01-29 Mark Kucera Tabbed divider making apparatus and method
US8038826B2 (en) 2007-02-01 2011-10-18 Scott Office Systems, Llc Tabbed divider making apparatus and method
US20090270237A1 (en) * 2008-02-12 2009-10-29 Scott Office Systems Llc Customized tab machine
US20110065562A1 (en) * 2008-02-12 2011-03-17 Scott Office Systems Llc Customized tab machine
US8002688B2 (en) * 2008-02-12 2011-08-23 Scott Office Systems Llc Customized tab machine

Also Published As

Publication number Publication date
CA1010660A (en) 1977-05-24
GB1436481A (en) 1976-05-19
USB359825I5 (enrdf_load_stackoverflow) 1975-01-28

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AS Assignment

Owner name: WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP.

Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:AO, INC. A DE CORP.;REEL/FRAME:004041/0934

Effective date: 19820528

Owner name: AO,INC.SOUTHBRIDGE, MASS. A CORP OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN OPTICAL CORPORATION;REEL/FRAME:004056/0229

Effective date: 19820513

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Owner name: WARNER-LAMBERT CANADA, INC.

Free format text: SECURITY INTEREST;ASSIGNOR:AO, INC., A DE CORP.;REEL/FRAME:004073/0046

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Owner name: WARNER-LAMBERT TECHNOLOGIES, INC., A DE CORP.

Free format text: SECURITY INTEREST;ASSIGNOR:AO, INC., A DE CORP.;REEL/FRAME:004073/0046

Effective date: 19820528

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Effective date: 19820621

Owner name: IRVING TRUST COMPANY, NEW YORK

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Effective date: 19820621

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Owner name: AMERICAN OPTICAL CORPORATION, A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:AO, INC., A DE. CORP.;WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP.;IRVING TRUST COMPANY, A NY CORP.;REEL/FRAME:004477/0409;SIGNING DATES FROM 19850923 TO 19851023

AS Assignment

Owner name: IRVING TRUST COMPANY

Free format text: SECURITY INTEREST;ASSIGNORS:AMERICAN OPTICAL CORPORATION;RADIAC ABRASIVES (EAST) INC.,;RADIAC ABRASIVES (WEST) INC.,;REEL/FRAME:004918/0235

Effective date: 19880527

Owner name: IRVING TRUST COMPANY, NEW YORK

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Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANK OF NEW YORK, THE (FORMERLY KNOWN AS IRVING TRUST COMPANY);REEL/FRAME:005535/0035

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Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANK OF NEW YORK, THE (FORMERLY KNOWN AS IRVING TRUST COMPANY);REEL/FRAME:005535/0035

Effective date: 19900413