FR2450788B1 - COMPOSITE MULTIFOCAL STICKS OR SEGMENTS AND PROCESS FOR THEIR MANUFACTURE - Google Patents

COMPOSITE MULTIFOCAL STICKS OR SEGMENTS AND PROCESS FOR THEIR MANUFACTURE

Info

Publication number
FR2450788B1
FR2450788B1 FR8005076A FR8005076A FR2450788B1 FR 2450788 B1 FR2450788 B1 FR 2450788B1 FR 8005076 A FR8005076 A FR 8005076A FR 8005076 A FR8005076 A FR 8005076A FR 2450788 B1 FR2450788 B1 FR 2450788B1
Authority
FR
France
Prior art keywords
sticks
segments
manufacture
multifocal
composite
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
Application number
FR8005076A
Other languages
French (fr)
Other versions
FR2450788A1 (en
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.)
Corning Glass Works
Original Assignee
Corning Glass Works
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 Corning Glass Works filed Critical Corning Glass Works
Publication of FR2450788A1 publication Critical patent/FR2450788A1/en
Application granted granted Critical
Publication of FR2450788B1 publication Critical patent/FR2450788B1/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/02—Forming molten glass coated with coloured layers; Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts
    • C03B17/025—Tubes or rods
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/40—Product characteristics

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)
FR8005076A 1979-03-08 1980-03-06 COMPOSITE MULTIFOCAL STICKS OR SEGMENTS AND PROCESS FOR THEIR MANUFACTURE Expired FR2450788B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1874779A 1979-03-08 1979-03-08

Publications (2)

Publication Number Publication Date
FR2450788A1 FR2450788A1 (en) 1980-10-03
FR2450788B1 true FR2450788B1 (en) 1985-09-27

Family

ID=21789586

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8005076A Expired FR2450788B1 (en) 1979-03-08 1980-03-06 COMPOSITE MULTIFOCAL STICKS OR SEGMENTS AND PROCESS FOR THEIR MANUFACTURE

Country Status (4)

Country Link
JP (1) JPS55159413A (en)
DE (1) DE3008548A1 (en)
FR (1) FR2450788B1 (en)
GB (1) GB2046241A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01319019A (en) * 1988-06-18 1989-12-25 Shin:Kk Production of contact lens for presbyopia

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899314A (en) * 1974-03-18 1975-08-12 American Optical Corp Lens manufacturing process
US3899315A (en) * 1974-04-15 1975-08-12 American Optical Corp Method of making glass clad glass lenses
CA1044930A (en) * 1974-12-16 1978-12-26 Emil W. Deeg Multifocal lenses and method of making same

Also Published As

Publication number Publication date
GB2046241A (en) 1980-11-12
FR2450788A1 (en) 1980-10-03
JPS55159413A (en) 1980-12-11
DE3008548A1 (en) 1980-09-18

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Legal Events

Date Code Title Description
ST Notification of lapse