US5550552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation shield
Assignee: Individual
•
Filing: 1993-10-04
•
Granted: 1996-08-27
•
Expires: 2013-10-04
Abstract
Abstract A shield for selectively preventing the propagation of electromagnetic radiation away from an antenna in the direction of the human operator for a cellular telephone and a transmitter, receiver or transceiver, the shield being formed of electrically conductive electromagnetic shield material applied to or embedded in the nonconductive insulating material encapsulating the antenna or to a nonconductive structure for the antenna and located in the area of the antenna which is in close proximity to the operator.
Inventors
- 👤 L. Thomas Oxley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:50
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/52; H01Q1/526; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/245
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A radiation shielding apparatus in combination with a cellular telephone radio transmitting device having a radiation emanating external antenna for transmission of electromagnetic radiation, said radiation shielding apparatus comprising a disc which shields the user from radiation emanating from the antenna toward the user and means for maintaining the disc at an operable position between the antenna and the user of the cellular telephone device so that at the operable position the disc is effective to prevent exposure of the user to the radiation during all transmission of electromagnetic radiation from the radiation emanating antenna.
Claim 2
Dependent Claim
95 words
A radiation shielding apparatus in combination with a cellular telephone radio transmitting device having a radiation emanating external antenna for transmission of electromagnetic radiation, said radiation shielding apparatus comprising a disc which shields the user from radiation emanating from the antenna toward the user and means for maintaining the disc at an operable position between the antenna and the user of the cellular telephone device so that at the operable position the disc is effective to prevent exposure of the user to the radiation during all transmission of electromagnetic radiation from the radiation emanating antenna.
Claim 3
Dependent Claim
26 words
The apparatus according to claim 1 wherein said disc is formed from a material selected from a group consisting of copper, chromium, aluminum, brass and magnesium.
Claim 4
Dependent Claim
19 words
The apparatus according to claim 1 wherein said electromagnetic radiation shielding material has a relative conductivity greater than 0.5.
Claim 5
Dependent Claim
17 words
The apparatus according to claim 1 wherein said disc functions as a radio antenna signal ground plane.
Claim 6
Dependent Claim
24 words
The apparatus according to claim 1 wherein said disc increases the effectiveness of the radio frequency signal transmission and/or reception of said antenna assembly.
Claim 7
Dependent Claim
28 words
The apparatus according to claim 1 wherein said disc is attached to one of a cellular telephone, satellite telephone, two-way radio, transceiver or portable radio frequency communications device.
Claim 8
Dependent Claim
79 words
A radiation shielding apparatus for use with an antenna for transmitting and/or receiving radio frequency signals and, for selectively directing the flow of antenna radiation away from the user, said apparatus comprising: a ground shield attached to the antenna which shields the user from radiation emanating from the antenna, said ground shield is in the form of a disc which permits the unobstructed flow of radio frequency antenna signals from said disc in the general direction of open space.
Claim 9
Dependent Claim
79 words
A radiation shielding apparatus for use with an antenna for transmitting and/or receiving radio frequency signals and, for selectively directing the flow of antenna radiation away from the user, said apparatus comprising: a ground shield attached to the antenna which shields the user from radiation emanating from the antenna, said ground shield is in the form of a disc which permits the unobstructed flow of radio frequency antenna signals from said disc in the general direction of open space.
Claim 10
Dependent Claim
28 words
The apparatus according to claim 7 wherein said disc is attached to one of a cellular telephone, satellite telephone, two-way radio, transceiver or portable radio frequency communications device.
Claim 11
Dependent Claim
23 words
The apparatus according to claim 7 wherein said disc increases the effectiveness of the radio frequency signal transmission and/or reception of said antenna.
Claim 12
Dependent Claim
26 words
The apparatus according to claim 7 wherein said disc is formed from a material selected from the group consisting of copper, chromium, aluminum, brass and magnesium.
References Cited (Backward Citations)
US2026652A
Cited
US2082820A
Cited
US2425585A
Cited
US4342037A
Cited
US5267297A
Cited
US5335366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-27 | 2000-02-26 | 2000-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-27 | 2004-02-26 | 2004-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-27 | 2008-02-26 | 2008-08-27 | $7700.00 | Window Closed / Lapsed |