US4088470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of heat sagging glass articles
Assignee: Corning Glass Works
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Filing: 1977-03-03
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Granted: 1978-05-09
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Expires: 1997-03-03
Abstract
Abstract A preformed sheet of glass is formed by sagging such a sheet with a plurality of linked indentations comprising multiple curved interdependent impressions from which a plurality of sagged pieces are cut to produce lenses in final form.
Inventors
- 👤 Andre Bourg
- 👤 Jean P. M. Hazart
- 👤 Jacques Y. Jouret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:26
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0006; G02B3/0012; G02B3/0031; C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0252; C03C; C03C4/00; C03C4/04; C03C4/06; G02B3/0037; G02B3/005; G02B3/0056
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
A process for forming lenses for spectacles comprising, providing an alveolated mold having a plurality of juxtapositioned upwardly open concave surface portions with the uppermost edges of the concave surfaces being continuous circular edges providing raised linear support portions between said concave surfaces, positioning a sheet of glass upon said alveolated mold and supporting such sheet by said raised linear support portions, subjecting said sheet of glass to a thermal sagging cycle, uniformly sagging such sheet downwardly within the concave portions of said alveolated mold to form said sheet into a plurality of substantially spherical shapes with uniformly curved indentations in an upper surface of said sheet, discontinuing the thermal sagging cycle prior to there being contact between the sheet and the concave surface portions, cooling the sagged sheet to form a glass preform with a plurality of interconnected curved indentations, and cutting finished lenses from the uniformly curved indentations formed in said preform.
Claim 2
Dependent Claim
154 words
A process for forming lenses for spectacles comprising, providing an alveolated mold having a plurality of juxtapositioned upwardly open concave surface portions with the uppermost edges of the concave surfaces being continuous circular edges providing raised linear support portions between said concave surfaces, positioning a sheet of glass upon said alveolated mold and supporting such sheet by said raised linear support portions, subjecting said sheet of glass to a thermal sagging cycle, uniformly sagging such sheet downwardly within the concave portions of said alveolated mold to form said sheet into a plurality of substantially spherical shapes with uniformly curved indentations in an upper surface of said sheet, discontinuing the thermal sagging cycle prior to there being contact between the sheet and the concave surface portions, cooling the sagged sheet to form a glass preform with a plurality of interconnected curved indentations, and cutting finished lenses from the uniformly curved indentations formed in said preform.
Claim 3
Dependent Claim
46 words
A process for forming lenses as defined in claim 1 including the steps of positioning a sheet of photochromic glass upon said alveolated mold, and simultaneously developing the photochromic properties of said sheet while sagging such sheet downwardly within the concave portions of said alveolated mold.
Claim 4
Dependent Claim
153 words
A process for forming lenses for spectacles comprising, providing an alveolated mold having a plurality of juxtapositioned upwardly open concave surface portions with the uppermost edges of the concave surfaces rising into a plurality of support points intermediate said adjacent concave surfaces, positioning a sheet of glass upon said alveolated mold and supporting such sheet by said raised point support portions, subjecting said sheet of glass to a thermal sagging cycle, uniformly sagging such sheet downwardly within the concave portions of said alveolated mold to form said sheet into a plurality of substantially spherical shapes with uniformly curved indentations in an upper surface of said sheet, discontinuing the thermal sagging cycle prior to there being contact between the sheet and the concave surface portions, cooling the sagged sheet to form a glass preform with a plurality of interconnected curved indentations, and cutting finished lenses from the uniformly curved indentations formed in said preform.
Claim 5
Dependent Claim
153 words
A process for forming lenses for spectacles comprising, providing an alveolated mold having a plurality of juxtapositioned upwardly open concave surface portions with the uppermost edges of the concave surfaces rising into a plurality of support points intermediate said adjacent concave surfaces, positioning a sheet of glass upon said alveolated mold and supporting such sheet by said raised point support portions, subjecting said sheet of glass to a thermal sagging cycle, uniformly sagging such sheet downwardly within the concave portions of said alveolated mold to form said sheet into a plurality of substantially spherical shapes with uniformly curved indentations in an upper surface of said sheet, discontinuing the thermal sagging cycle prior to there being contact between the sheet and the concave surface portions, cooling the sagged sheet to form a glass preform with a plurality of interconnected curved indentations, and cutting finished lenses from the uniformly curved indentations formed in said preform.
Claim 6
Dependent Claim
46 words
A process for forming lenses as defined in claim 3 including the steps of positioning a sheet of photochromic glass upon said alveolated mold, and simultaneously developing the photochromic properties of said sheet while sagging such sheet downwardly within the concave portions of said alveolated mold.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |