Patent US3812342A successfully refreshed from Google Patents.
US3812342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting fixture lens
Assignee: Esquire Inc
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Filing: 1973-01-22
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Granted: 1974-05-21
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Expires: 1993-01-22
Abstract
Abstract A lighting fixture combination including a housing enclosing at least one bulb and having an opening for light and a housing window across the opening comprising a thin film of fluorocarbon, preferably Teflon FEP. Also disclosed are various means for deforming the thin film to cause it to be stretched tautly across the opening and be secured securely in place.
Inventors
- 👤 A Mcnamara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:57
CPC Classifications
F; F21; F21V; F21V3/00; F21V3/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum, such that said bulb is sufficiently recessed so that the plane of an opening through which light emanates does not intersect said bulb; and a housing window comprising a thin film of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene stretched across said opening in said plane.
Claim 2
Dependent Claim
67 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum, such that said bulb is sufficiently recessed so that the plane of an opening through which light emanates does not intersect said bulb; and a housing window comprising a thin film of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene stretched across said opening in said plane.
Claim 3
Dependent Claim
28 words
A lighting fixture combination as set forth in claim 1, wherein said thin film of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene is no thicker than about 10 mils.
Claim 4
Dependent Claim
66 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum such that said bulb is sufficiently recessed that the plane of an opening through which light emanates does not intersect said bulb; and a housing window comprising a non-self-supporting film of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene secured across said opening in said plane.
Claim 5
Dependent Claim
66 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum such that said bulb is sufficiently recessed that the plane of an opening through which light emanates does not intersect said bulb; and a housing window comprising a non-self-supporting film of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene secured across said opening in said plane.
Claim 6
Dependent Claim
68 words
In a light fixture housing for retaining therein at least one light bulb that emits light in the visible spectrum, housing window means comprising: a thin film window of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene; and means for securing said thin film across the opening of said housing through which light emanates, said means securing said film by deforming said film to place said film in stretched tension.
Claim 7
Dependent Claim
68 words
In a light fixture housing for retaining therein at least one light bulb that emits light in the visible spectrum, housing window means comprising: a thin film window of fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene; and means for securing said thin film across the opening of said housing through which light emanates, said means securing said film by deforming said film to place said film in stretched tension.
Claim 8
Dependent Claim
24 words
A light fixture housing in accordance with claim 4, wherein said securing means includes a deformable frame for stretching and securing said film therein.
Claim 9
Dependent Claim
28 words
A light fixture housing in accordance with claim 4, wherein said securing means includes a two-part frame having mating parts for deforming and stretching therebetween said thin film.
Claim 10
Dependent Claim
62 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum, such that said bulb is sufficiently recessed so that the plane of an opening through which light emanates does not intersect said bulb; and a housing window comprising a thin film of fluorocarbon stretched across said opening in said plane.
Claim 11
Dependent Claim
62 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum, such that said bulb is sufficiently recessed so that the plane of an opening through which light emanates does not intersect said bulb; and a housing window comprising a thin film of fluorocarbon stretched across said opening in said plane.
Claim 12
Dependent Claim
81 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum, such that said bulb is sufficiently recessed so that the plane of an opening through which light emanates does not intersect said bulb; and a thin film of material stretched across said opening selected from the group consisting of a fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene; polytetrafluoroethylene; a copolymer of ethylene and tetrafluoroethylene; polychlorotrifluoroethylene; polyvinylidene fluoride; polymethylpentene; and polysulfone.
Claim 13
Dependent Claim
81 words
A lighting fixture combination, comprising: a housing for enclosing at least one light bulb therein that emits light in the visible spectrum, such that said bulb is sufficiently recessed so that the plane of an opening through which light emanates does not intersect said bulb; and a thin film of material stretched across said opening selected from the group consisting of a fluorocarbon copolymer combining tetrafluoroethylene and hexafluoropropylene; polytetrafluoroethylene; a copolymer of ethylene and tetrafluoroethylene; polychlorotrifluoroethylene; polyvinylidene fluoride; polymethylpentene; and polysulfone.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |