US4494833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eyeglass-frame
Assignee: Nippon Gakki Co Ltd
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Filing: 1982-04-13
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Granted: 1985-01-22
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Expires: 2002-04-13
Abstract
Abstract A metallic eyeglass-frame, in particular its each bow has a core-to-covering structure in which high silver or gold-content covering is clad to the surface of a super elastic core made of Cu-Sn-Zn, Cu-Al-Zu or Cu-Al-Ni alloys in order to reduce plastic deformation during use and assure high work ability in production, thereby allowing the eyeglass-frame to constantly rest stably on the wearer's facial construction with no increase in uncomfortableness and fatigue on the wearer.
Inventors
- 👤 Masayuki Takamura
- 👤 Kazuo Kurahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:27
CPC Classifications
G; G02; G02C; G02C5/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
An eyeglass-frame comprising a pair of bows having a core-to-covering structure which includes a core exhibiting super elasticity at room temperatures and a covering clad to said core, said core being made of a material chosen from a group consisting of copper-tin-zinc alloys, copper-aluminum-zinc alloys and copper-aluminum nickel alloys, and said covering being made of a material chosen from a group consisting of silver, silver base alloys, gold and gold base alloys.
Claim 2
Dependent Claim
72 words
An eyeglass-frame comprising a pair of bows having a core-to-covering structure which includes a core exhibiting super elasticity at room temperatures and a covering clad to said core, said core being made of a material chosen from a group consisting of copper-tin-zinc alloys, copper-aluminum-zinc alloys and copper-aluminum nickel alloys, and said covering being made of a material chosen from a group consisting of silver, silver base alloys, gold and gold base alloys.
Claim 3
Dependent Claim
31 words
An eyeglass-frame as claimed in claim 1 in which said copper-tin-zinc alloy for said core containes 15.5 to 18.9% by weight of tin and up to 12.0% by weight of zinc.
Claim 4
Dependent Claim
31 words
An eyeglass-frame as claimed in claim 1 in which said copper-aluminum-zinc alloy for said core contains 0.01 to 1% by weight of aluminum and 38 to 45% by weight of zinc.
Claim 5
Dependent Claim
21 words
An eyeglass-frame as claimed in claim 3 in which said copper-aluminum-zinc alloy further contains 0.05 to 0.8% by weight of silicon.
Claim 6
Dependent Claim
28 words
An eyeglass-frame as claimed in claim 1 in which said copper-aluminum-nickel alloy contains 13.3 to 15.0% by weight of aluminum and 3 to 5% by weight of nickel.
Claim 7
Dependent Claim
33 words
An eyeglass-frame as claimed in claim 5 in which said copper-aluminum-nickel alloy further contains at least one of 0.05 to 0.8% by weight of silicon and 1 to 3% by weight of chromium.
Claim 8
Dependent Claim
33 words
An eyeglass-frame as claimed in claim 1 in which said silver base alloy contains at least on of 1 to 25% by weight of copper and 0.1 to 4% by weight of palladium.
Claim 9
Dependent Claim
41 words
An eyeglass-frame as claimed in claim 7 in which said silver base alloy further contains at least one of 0.1 to 10% by weight of gold, 0.1 to 2% by weight of zinc and up to 10% by weight of nickel.
Claim 10
Dependent Claim
40 words
An eyeglass-frame as claimed in claim 1 in which said gold base alloy contains at least one of 1 to 40% by weight of copper, 1 to 20% by weight of zinc and up to 30% by weight of silver.
Claim 11
Dependent Claim
34 words
An eyeglass-frame as claimed in claim 9 in which said gold base alloy further contains at least one of up to 10% by weight of palladium and up to 5% by weight of nickel.
Claim 12
Dependent Claim
23 words
An eyeglass-frame as claimed in claim 1 in which the thickness of said covering is in a range from 2 to 150 μm.
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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |