Radiation power limiter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 8, 2004
Grant Date -
N/A
app pub date -
Feb 12, 1988
filing date -
Feb 12, 1988
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed herein is an arrangement for shielding electronic sensors from undesired microwave or millimeter wave radiation. In this arrangement, reflective element is disposed in the sensor path to intercept incoming signals. The reflective element has a pluraity of adjacent parallel ridges therein having sloped faces angled for reflecting incoming desired infrared radiation onto the sensor. The width of the ridges are selected so that desired signals will be reflected by the sloped ridge faces but undesired microwave or millimeter radiation will be reflected by the overall major surface of the mirror. Accordingly, undesired microwave or millimeter radiation will be reflected away from the sensor by the overall front major surface thereby preventing the sensor from being damaged.
First Claim
all claims..Other Claims data not available
Family
- No Family data available.
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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DIRECTV LLC | 2260 E IMPERIAL HIGHWAY EL SEGUNDO CA 90245 |
International Classification(s)

- 1988 Application Filing Year
- G01J Class
- 310 Applications Filed
- 10 Patents Issued To-Date
- 3.23 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Eckhardt, Wilfried O | Malibu, CA | 2 | 4 |
# of filed Patents : 2 Total Citations : 4 | |||
Williamson, Weldon S | Malibu, CA | 39 | 760 |
# of filed Patents : 39 Total Citations : 760 |
Cited Art Landscape
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Patent Citation Ranking
- 3 Citation Count
- G01J Class
- 3.95 % this patent is cited more than
- 21 Age
Forward Cite Landscape
- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
Full Text

Legal Events
Date | Code | Event | Description |
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Mar 06, 2013 | FPAY | FEE PAYMENT | year of fee payment: 12 |
Mar 18, 2009 | FPAY | FEE PAYMENT | year of fee payment: 8 |
Mar 23, 2005 | FPAY | FEE PAYMENT | year of fee payment: 4 |
Oct 16, 2001 | I | Issuance | |
Sep 27, 2001 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
Oct 05, 1999 | F | Filing | |
Oct 05, 1999 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ABE, KOJI;MIYAHARA, REIJI;NANBA, TOMIYUKI;AND OTHERS;REEL/FRAME:010303/0799;SIGNING DATES FROM 19990910 TO 19990922 Owner name: SHISEIDO COMPANY, LTD., JAPAN |
Oct 07, 1998 | PD | Priority Date |

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