Patent US4825075A successfully refreshed from Google Patents.
US4825075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-electronic gain control
Assignee: Lutron Technology Co LLC
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Filing: 1987-07-30
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Granted: 1989-04-25
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Expires: 2007-07-30
Abstract
Abstract A receiver for a radiated electromagnetic signal includes elements that respectively transmit a high percentage and a low percentage of the incident signal, in combination with a detector. The device is adapted for mounting on or near a horizontal surface, such as a ceiling. The signal is preferably in the infrared region of the spectrum. The receiver provides non-electronic gain control and, when the high-transmission element passes the signal wavelength preferentially over other wavelengths, it also provides improved noise immunity.
Inventors
- 👤 Elliot Jacoby
- 👤 Stephen J. Yuhasz
- 👤 Noel Mayo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:59
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H04; H04B; H04B10/00; H04B10/60; G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J1/0407; G01J1/0418; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08C; G08C23/00; G08C23/04; G01J1/0266; G01J1/0295; Y; Y10; Y10S; Y10S250/00; Y10S250/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A device for receiving a radiated electromagnetic signal arriving at a substantially horizontal first surface; said device comprising: (a) signal detector means, adapted for mounting in a fixed relationship to said first surface, (b) a low transmission element, adapted for mounting in spaced-apart relationship to said first surface, having a second surface, and comprising a material that transmits no more than 50% of signal arriving at normal incidence to said second surface, and (c) a high-transmission element, surrounding said signal detector means in a horizontal plane and extending substantially vertically between said first surface and said low-transmission element.
Claim 2
Independent Claim
98 words
A device for receiving a radiated electromagnetic signal arriving at a substantially horizontal first surface; said device comprising: (a) signal detector means, adapted for mounting in a fixed relationship to said first surface, (b) a low transmission element, adapted for mounting in spaced-apart relationship to said first surface, having a second surface, and comprising a material that transmits no more than 50% of signal arriving at normal incidence to said second surface, and (c) a high-transmission element, surrounding said signal detector means in a horizontal plane and extending substantially vertically between said first surface and said low-transmission element.
Claim 3
Dependent Claim
17 words
The device of claim 1, in which said signal comprises an infrared signal of a predetermined wavelength.
Claim 4
Dependent Claim
14 words
The device of claim 2, in which said signal detector means comprises a photodiode.
Claim 5
Dependent Claim
24 words
The device of claim 1, in which said low-transmission element comprises a substantially planar sheet adapted for mounting substantially parallel to said first surface.
Claim 6
Dependent Claim
14 words
The device of claim 2, in which said low-transmission element comprises a thermoplastic material.
Claim 7
Dependent Claim
12 words
The device of claim 5, in which said thermoplastic comprises acrylonitrile-butadiene-styrene copolymer.
Claim 8
Dependent Claim
24 words
The device of claim 2, in which said high-transmission element transmits substantially less radiation at shorter wavelengths than it does at the signal wavelength.
Claim 9
Dependent Claim
26 words
The device of claim 2, in which said high-transmission element transmits substantially less radiation at shorter and longer wavelengths than it does at the signal wavelength.
Claim 10
Dependent Claim
35 words
The device of claim 4, in which said high-transmission element comprises a substantially cylindrical hollow tube, having a first circular face adjacent to said first surface and a second circular face adjoining said planar sheet.
Claim 11
Dependent Claim
28 words
The device of claim 9, in which said sheet comprises a substantially circular disk, having a diameter that is greater than the outer diameter of the hollow tube.
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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |