Patent US4889958A successfully refreshed from Google Patents.
US4889958A
Expired / Lapsed
US
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Building with electromagnetic shield structure for individual floors
Assignee: Shimizu Construction Co Ltd
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Filing: 1987-06-10
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Granted: 1989-12-26
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Expires: 2007-06-10
Abstract
Abstract A building with an electromagnetic shield structure for individual floors uses an electromagnetic shielding material in a body of the building and in openings such as windows and doorways, and the external wall surface of the building is covered with an electromagnetic shielding layer. An electromagnetically shielded space within the building is divided into individual floors by floor partitions using an electromagnetic shielding material. Wireless communication utilizing electric waves is carried out within the building, with the same frequency band or any desired frequency band being allotted to each floor. With the above arrangement, sets of communications equipment using the same frequency band on one floor can communicate with one another without interfering with sets on another floor, even though the sets of equipment on the other floors use the same frequency band. Accordingly, by installing sets of communications equipment of a fixed frequency band irrespective of the number of floors in the building, information can be communicated freely within the building.
Inventors
- 👤 Takeshi Takahashi
- 👤 Masatake Nakamura
- 👤 Yoshiji Yabana
- 👤 Toshiuyki Ishikawa
- 👤 Koji Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:01
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; H; H04; H04B; H04B15/00; H05; H05K; H05K9/00; H05K9/0001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A multi-floor building having an electromagnetic shield structure for individual building floors, characterized in that an electromagnetic shielding material is positioned in the exterior walls of the building, in the windows, doorways and other openings in said building exterior walls, in each floor slab between the floors of said building and in the interior of said building in the stairwells and openings between the individual floors of said building, each said floor slab having a ceiling plate having an overlapping structure with an electromagnetic shielding material at said overlapping structure and an electromagnetic shielding material covering the entirely of the ceiling structure at each floor slab integrally connected to said overlapping structure electromagnetic shielding material.
Claim 2
Dependent Claim
115 words
A multi-floor building having an electromagnetic shield structure for individual building floors, characterized in that an electromagnetic shielding material is positioned in the exterior walls of the building, in the windows, doorways and other openings in said building exterior walls, in each floor slab between the floors of said building and in the interior of said building in the stairwells and openings between the individual floors of said building, each said floor slab having a ceiling plate having an overlapping structure with an electromagnetic shielding material at said overlapping structure and an electromagnetic shielding material covering the entirely of the ceiling structure at each floor slab integrally connected to said overlapping structure electromagnetic shielding material.
Claim 3
Dependent Claim
21 words
A building according to claim 1, characterized in that, at each floor slab, an antenna is arranged below said ceiling plate.
Claim 4
Dependent Claim
67 words
A building according to claim 2, characterized in that, at each floor slab, a stairway passing through said floor slab is partitioned by a partition wall, and an electromagnetic wave absorber is positioned within said partitioned stair wall, the entrance to each said stairway being arranged in such manner that electromagnetic waves will not pass directly between the entrances to the stairway of upper and lower floors.
Claim 5
Dependent Claim
21 words
A building according to claim 2, characterized in that frequency bands that differ from each other are used on adjacent floors.
Claim 6
Dependent Claim
109 words
A multi-floor building having an electromagnetic shield structure for individual building floors, characterized in that an electromagnetic shielding material is positioned in the exterior walls of the building, in the windows, doorways and other openings in said building exterior walls, in each floor slab between the floors of said building and in the interior of said building in the stairwells and openings between the individual floors of said building, at each floor slab, a stairway passing through said floor slab is partitioned by a partition wall, and an electromagnetic wave absorber is positioned within said partitioned stair wall, said stairway having a central separating wall and a spiral staircase.
Claim 7
Dependent Claim
109 words
A multi-floor building having an electromagnetic shield structure for individual building floors, characterized in that an electromagnetic shielding material is positioned in the exterior walls of the building, in the windows, doorways and other openings in said building exterior walls, in each floor slab between the floors of said building and in the interior of said building in the stairwells and openings between the individual floors of said building, at each floor slab, a stairway passing through said floor slab is partitioned by a partition wall, and an electromagnetic wave absorber is positioned within said partitioned stair wall, said stairway having a central separating wall and a spiral staircase.
Claim 8
Dependent Claim
44 words
A building according to claim 5, characterized in that, at each floor a slab is provided having an electromagnetic shielding property, the external wall and slab end portion being electrically integrated by an end form steel plate when concrete of the slab is poured.
References Cited (Backward Citations)
US2599944A
Cited
US3721746A
Cited
DE2419792A1
Cited
US4613530A
Cited
US4639914A
Cited
US4755630A
Cited
US4672658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |