US3724934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sunglasses having novel plastic optical element for lenses
Assignee: Polaroid Corp
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Filing: 1971-12-27
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Granted: 1973-04-03
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Expires: 1991-12-27
Abstract
Abstract An element for filtering infrared light useful for example, as an optical lens. A metal complex is advantageously employed as an infrared absorber in elements of the type described. The infrared absorbers can be represented by the following formula: WHERE Me is a metal of the first, second or third transition metal series which will provide a complex that is an effective infrared absorber and which is effectively transparent to light in the visible region of the spectrum and each R is selected from the group consisting of hydrogen, alkyl, aromatic, heterocyclic, nuclearly substituted aromatic rings and nuclearly substituted heterocyclic rings.
Inventors
- 👤 S Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:34
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; C; C08; C08K; C08K5/00; C08K5/0091; G02B5/00; G02B5/20; G02B5/22; G02B5/223
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A pair of sunglasses of claim 1 wherein said metal complex is of the formula:
Claim 2
Dependent Claim
24 words
A pair of sunglasses as defined in claim 2 wherein said Me moiety is selected from the group consisting of nickel, platinum and palladium.
Claim 3
Dependent Claim
49 words
In a pair of sunglasses having as its lens system, a plastic optical element comprising a sheet of light-polarizing material laminated between two substantially transparent plastic layers, the improvement wherein at least one of said transparent, plastic layers comprises a metal complex of a bis-(cis-1,2-alkyl, hydrogen, aryl or heterocyclic)ethylene-1,2-dithiolate).
Claim 4
Dependent Claim
44 words
A pair of sunglasses as defined in claim 4 wherein said infrared absorber is present in an amount such that the amount of light transmitted in the near infrared region is substantially no greater than the amount of visible light transmitted through said element.
Claim 5
Dependent Claim
20 words
A pair of sunglasses as defined in claim 4 wherein: said infrared absorber is a metal complex of the formula:
Claim 6
Dependent Claim
64 words
A pair of sunglasses having a lens system comprising, in order, a first transparent plastic sheet material; a first layer containing at least one infrared absorber; a sheet of light-polarizing material, a second layer containing at least one infrared absorber; and a second transparent plastic sheet material, said infrared absorber in at least one of said layers comprising a metal complex of the formula:
Claim 7
Dependent Claim
32 words
A pair of sunglasses as defined in claim 7 wherein each of said infrared absorber in said two layers contains a mixture of at least two of said complexes of said formula.
Claim 8
Dependent Claim
51 words
A pair of sunglasses as defined in claim 7 wherein said infrared absorber in said two layers is present in an amount such that the amount of light transmitted in the near infrared region of the spectrum is substantially no greater than the amount of visible light transmitted through said system.
Claim 9
Dependent Claim
20 words
A pair of sunglasses as defined in claim 7 wherein said infrared absorber is chosen from the group consisting of:
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |