US4611371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing an eyeglass-frame
Assignee: Nippon Gakki Co Ltd
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Filing: 1982-08-24
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Granted: 1986-09-16
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Expires: 2002-08-24
Abstract
Abstract As a substitute for brazing conventionally employed for attaching curved pad holders to rims of an eyeglass-frame, casting is used for formation of an eyeglass-frame including, in one body with its rims, straight pad holders which should thereafter be bend to a required configuration. Conventional troubles arising from use of brazing are fully removed.
Inventors
- 👤 Yoshihiro Fujino
- 👤 Kazuo Kurahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:40
CPC Classifications
G; G02; G02C; G02C13/00; G02C13/001; B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; G02C5/00; G02C5/12; Y; Y10; Y10T; Y10T29/00; Y10T29/31
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
An improved method for manufacturing an eyeglass-frame comprising the steps of: forming a metallic master model patterned after an eyeglass-frame and having a straight pad holder extending from an associated rim; covering said metallic master model with molten rubber in order to form a rubber female mold by separating said rubber from said metallic master model after said rubber has hardened; injecting molten wax into said rubber female mold in order to form a wax model by separating said wax from said rubber mold after said wax has hardened; immersing said wax model in a bath of heat-resistant material in order to form a heat-resistant material female mold; removing said wax model from said heat-resistant material female mold by heating; casting molten alloy into said heat-resistant material female mold to form a cast alloy having a straight section extending monolithically from a rim section; removing said cast alloy from said heat-resistant material female mold; and bending said straight section to a required pad holder configuration.
Claim 2
Dependent Claim
165 words
An improved method for manufacturing an eyeglass-frame comprising the steps of: forming a metallic master model patterned after an eyeglass-frame and having a straight pad holder extending from an associated rim; covering said metallic master model with molten rubber in order to form a rubber female mold by separating said rubber from said metallic master model after said rubber has hardened; injecting molten wax into said rubber female mold in order to form a wax model by separating said wax from said rubber mold after said wax has hardened; immersing said wax model in a bath of heat-resistant material in order to form a heat-resistant material female mold; removing said wax model from said heat-resistant material female mold by heating; casting molten alloy into said heat-resistant material female mold to form a cast alloy having a straight section extending monolithically from a rim section; removing said cast alloy from said heat-resistant material female mold; and bending said straight section to a required pad holder configuration.
Claim 3
Dependent Claim
25 words
An improved method as claimed in claim 1, in which said heat-resistant material is gypsum; and said molten alloy is a low melting point alloy.
Claim 4
Dependent Claim
26 words
An improved method as claimed in claim 1, in which said heat-resistant material is a ceramic; and said molten alloy is a high melting point alloy.
Claim 5
Dependent Claim
20 words
An improved method as claimed in claim 1, in which said heat-resistant material mold is subjected to sintering before casting.
References Cited (Backward Citations)
US3305358A
Cited
US4254544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |