US4422824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Germicidal ceiling fan blade
Assignee: US Bank NA
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Filing: 1982-03-29
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Granted: 1983-12-27
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Expires: 2002-03-29
Abstract
Abstract A fan blade, preferably for use with a ceiling fan, is constructed hollow with a top and bottom located so as to provide an air space sufficiently large enough to house one or more germicidal lights, preferably ultraviolet, in such manner that the light will burn while the fan blade rotates. Filtering pads, preferably charcoal impregnated and usually comprised of a plastic foam, are located at the leading and trailing edges of the air space between the top and bottom of the hollow blade for the absorption of smoke and other objectionable odors as the air passes through the lamp area. Preferably the leading edge is provided with pocket means to receive the air. Baffles may be provided to prevent the germicidal light from casting its light outside the confines of the hollow blade. The ends of the blade joining the leading and trailing edges thereof are closed. By virtue of all of the foregoing the hollow fan blade containing the ultraviolet germicidal light is rotated at a speed sufficient to cause the air with the airborne micro-organisms therein, such as bacteria and the like, to be exposed to the germicidal ultraviolet light for a sufficient length of time and ultraviolet intensity, which may be increased by the use of reflective surfaces within the blade, to destroy 99% of the micro-organisms and bacteria contained in the passing air.
Inventors
- 👤 Charles A. Eisenhardt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:55
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/08; F04D25/088
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
38 words
A fan blade comprising: a hollow housing having leading and trailing edges through which air may pass; a germicidal light located within said housing; and means to insure that said light will burn as the fan blade rotates.
Claim 2
Dependent Claim
38 words
A fan blade comprising: a hollow housing having leading and trailing edges through which air may pass; a germicidal light located within said housing; and means to insure that said light will burn as the fan blade rotates.
Claim 3
Dependent Claim
42 words
The blade of claim 1 adapted for use with a ceiling fan which moves a relatively large amount of air at a relatively slow speed; and said germicidal light is ultraviolet with an ultraviolet light output watts of 2537 A (angstrom units).
Claim 4
Dependent Claim
35 words
The blade of claim 2 having closed ends impervious to the light emitted from said germicidal light, and filtering pads located adjacent said leading and trailing edges, said filtering pads permitting air to pass therethrough.
Claim 5
Dependent Claim
25 words
The blade of claim 3 in which the filtering pad adjacent said leading edge is inset therefrom so as to provide an air receiving pocket.
Claim 6
Dependent Claim
33 words
The blade of claim 3 in which said housing is provided with reflective interior upper and lower surfaces to intensify the light emitting from said germicidal light within the confines of said housing.
Claim 7
Dependent Claim
31 words
The blade of claim 3 including baffles to shield the light emitting from said germicidal light so that only that amount of ultraviolet radiation permitted by law escapes from said housing.
Claim 8
Dependent Claim
18 words
The blade of claim 3 in which said filtering pads are comprised of plastic foam impregnated with carbon.
Claim 9
Dependent Claim
13 words
The blade of claim 3 in which said filtering pads are charcoal impregnated.
Claim 10
Dependent Claim
110 words
A ceiling fan blade having a hollow interior defined by top and bottom walls, closed ends, and a leading edge and a trailing edge through which air may pass; a germicidal ultraviolet light located within said hollow interior so that light emitting from said germicidal light contacts the air passing through said hollow interior; means to insure that said germicidal light will burn while said ceiling fan blade rotates; and charcoal impregnated filtering pads at said leading and trailing edges, between said top and bottom walls, for the absorption of smoke and other objectionable odors as air passes through said hollow interior from said leading edge to said trailing edge.
Claim 11
Dependent Claim
110 words
A ceiling fan blade having a hollow interior defined by top and bottom walls, closed ends, and a leading edge and a trailing edge through which air may pass; a germicidal ultraviolet light located within said hollow interior so that light emitting from said germicidal light contacts the air passing through said hollow interior; means to insure that said germicidal light will burn while said ceiling fan blade rotates; and charcoal impregnated filtering pads at said leading and trailing edges, between said top and bottom walls, for the absorption of smoke and other objectionable odors as air passes through said hollow interior from said leading edge to said trailing edge.
Claim 12
Dependent Claim
27 words
The ceiling fan blade of claim 9 in which the filtering pad at said leading edge is inset therefrom so as to define an air receiving pocket.
Claim 13
Dependent Claim
34 words
The ceiling fan of claim 9 in which baffles are provided to shield the light emitting from said germicidal ultraviolet light so that undue amounts of radiation do not escape from said hollow interior.
Claim 14
Dependent Claim
32 words
The ceiling fan blade of claim 9 in which the interior sides of said top and bottom walls are provided with a reflective surface to intensify the light within said hollow interior.
Claim 15
Dependent Claim
76 words
The ceiling fan blade of claim 9 in which the filtering pad at said leading edge is inset therefrom so as to define an air receiving pocket; baffles are provided to shield light emitting from said germicidal ultraviolet light so that undue amounts of radiation do not escape from said hollow interior; and the interior sides of said top and bottom walls are provided with a reflective surface to intensify the light within said hollow interior.
Claim 16
Dependent Claim
41 words
The ceiling fan blade of claim 9 including a separate electrical circuit with its own separate switch to allow said germicidal ultraviolet light to remain turned off while said blade may be used as a regular blade without the germicidal function.
Claim 17
Dependent Claim
31 words
The blade of claim 14 including a green glass jewel placed in the lower half of the hollow blade to indicate whether said ultraviolet germicidal light is turned on or off.
Claim 18
Independent Claim
76 words
A method of causing air with airborne micro-organisms therein to be exposed to germicidal ultraviolet light for a sufficient length of time and ultraviolet intensity to destroy 95% or more of the micro-organisms contained in the air, which method comprises the steps of locating a germicidal ultraviolet light within a hollow ceiling fan blade in such manner that the light will burn while the fan blade rotates, and causing said hollow ceiling fan blade to rotate.
Claim 19
Independent Claim
76 words
A method of causing air with airborne micro-organisms therein to be exposed to germicidal ultraviolet light for a sufficient length of time and ultraviolet intensity to destroy 95% or more of the micro-organisms contained in the air, which method comprises the steps of locating a germicidal ultraviolet light within a hollow ceiling fan blade in such manner that the light will burn while the fan blade rotates, and causing said hollow ceiling fan blade to rotate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |