GB739341A - Improvements in or relating to forming and fusing multifocal lens - Google Patents

Improvements in or relating to forming and fusing multifocal lens

Info

Publication number
GB739341A
GB739341A GB1821/54A GB182154A GB739341A GB 739341 A GB739341 A GB 739341A GB 1821/54 A GB1821/54 A GB 1821/54A GB 182154 A GB182154 A GB 182154A GB 739341 A GB739341 A GB 739341A
Authority
GB
United Kingdom
Prior art keywords
segment
mould
jan
deposited
glass
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
GB1821/54A
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.)
PPG Industries Inc
Original Assignee
Pittsburgh Plate Glass Co
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 Pittsburgh Plate Glass Co filed Critical Pittsburgh Plate Glass Co
Publication of GB739341A publication Critical patent/GB739341A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00028—Bifocal lenses; Multifocal lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/22—Uniting glass lenses, e.g. forming bifocal 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

Abstract

739,341. Bifocal lenses. PITTSBURGH PLATE GLASS CO. Jan. 21, 1954 [Jan. 23, 1953], No. 1821/54. Class 56. In the manufacture of a bifocal lens a preformed minor segment 14 is deposited, polished face upward, in a depression 10 in the concave face of a mould member 8. At another station the segment is heated and at another station molten glass G, of a different refractive index, is flowed thereover from a furnace outlet 11 until sheared at 12. The mould then, after passing partial cooling stations, passes to a station where the coacting mould ring 29 and plunger 37 form the major segment from the deposited glass G to which the minor segment becomes welded.
GB1821/54A 1953-01-23 1954-01-21 Improvements in or relating to forming and fusing multifocal lens Expired GB739341A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US321034XA 1953-01-23 1953-01-23

Publications (1)

Publication Number Publication Date
GB739341A true GB739341A (en) 1955-10-26

Family

ID=21863118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1821/54A Expired GB739341A (en) 1953-01-23 1954-01-21 Improvements in or relating to forming and fusing multifocal lens

Country Status (5)

Country Link
BE (1) BE525925A (en)
CH (1) CH321034A (en)
FR (1) FR1095674A (en)
GB (1) GB739341A (en)
NL (2) NL85388C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068671A (en) * 1959-01-26 1962-12-18 Corning Glass Works Method of making bifocal lenses
US3130029A (en) * 1959-06-23 1964-04-21 Bausch & Lomb Method for making fused multifocal lenses
US3130028A (en) * 1959-05-26 1964-04-21 Pittsburgh Plate Glass Co Glass feeding
US3149948A (en) * 1957-10-07 1964-09-22 Pittsburgh Plate Glass Co Method for forming multifocal lens blanks
US3278285A (en) * 1962-07-04 1966-10-11 Pilkington Brothers Ltd Method and apparatus for the pressure moulding of articles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006020991B4 (en) 2006-05-04 2009-09-10 Carl Zeiss Ag Process for producing a shaped body of glass or glass ceramic

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149948A (en) * 1957-10-07 1964-09-22 Pittsburgh Plate Glass Co Method for forming multifocal lens blanks
US3068671A (en) * 1959-01-26 1962-12-18 Corning Glass Works Method of making bifocal lenses
US3130028A (en) * 1959-05-26 1964-04-21 Pittsburgh Plate Glass Co Glass feeding
US3130029A (en) * 1959-06-23 1964-04-21 Bausch & Lomb Method for making fused multifocal lenses
US3278285A (en) * 1962-07-04 1966-10-11 Pilkington Brothers Ltd Method and apparatus for the pressure moulding of articles

Also Published As

Publication number Publication date
CH321034A (en) 1957-04-30
BE525925A (en)
NL184568C (en)
FR1095674A (en) 1955-06-06
NL85388C (en)

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