Patent US3584134A successfully refreshed from Google Patents.
US3584134A
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Shielded air vents
Assignee: LECTRO MAGNETICS Inc
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Filing: 1968-11-21
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Granted: 1971-06-08
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Expires: 1988-11-21
Abstract
Abstract Shielding for vents of a shielded rooms is disclosed; two different, air-permeable radiation attenuators are arranged at right angles. The attenuator for high frequencies is a dual shield, each one thereof being of the multiwaveguide type. The attenuator for the lower frequencies is constructed of a plurality of overlaid corrugated wire cloth layers.
Inventors
- 👤 Frederick J Nichols
- 👤 James C Senn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:23
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/0041
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
Shielding air vent of a shielded room wherein the air vent includes a bend dividing the air vent into first and second portions comprising: a first shield extending transversely across the first portion of the vent and with the first shield having a large plurality of air passageWays defined by electrically and magnetically conductive means oriented at different directions, essentially at random, the several air passageways having essentially angled or curved configuration anywhere within the shield; and a second shield extending transversely across the second portion of the vent and with the second shield disposed transverse to the first shield and being defined by a plurality of waveguidetype metallic ducts with a cutoff frequency above the range of frequencies requiring shielding.
Claim 2
Dependent Claim
121 words
Shielding air vent of a shielded room wherein the air vent includes a bend dividing the air vent into first and second portions comprising: a first shield extending transversely across the first portion of the vent and with the first shield having a large plurality of air passageWays defined by electrically and magnetically conductive means oriented at different directions, essentially at random, the several air passageways having essentially angled or curved configuration anywhere within the shield; and a second shield extending transversely across the second portion of the vent and with the second shield disposed transverse to the first shield and being defined by a plurality of waveguidetype metallic ducts with a cutoff frequency above the range of frequencies requiring shielding.
Claim 3
Dependent Claim
25 words
Shielding air vent as disclosed in claim 1, the ducts of the plurality of waveguide-type ducts having length exceeding width dimensions of the individual ducts.
Claim 4
Dependent Claim
30 words
Shielding air vent as set forth in claim 1 and comprising a third shield in the vent essentially similar to the second shield and arranged at a particular distance therefrom.
Claim 5
Dependent Claim
52 words
Shielding air vent as set forth in claim 3, the duct lengths of the second and third shield as respectively defining the thickness of the shields, being essentially similar and the distance between the second and third shields being essentially similar to the thickness of each of said second and third shields
Claim 6
Dependent Claim
31 words
Shielding air vent as set forth in claim 1, the first shield including a plurality of metallic wire cloth layers, superimposed at random orientation of the wires of the cloth layers.
Claim 7
Dependent Claim
128 words
Shielding air vent of a shielded room and wherein the air vent includes a bend dividing the air vent into first and second portions comprising: first means extending transversely across the first portion of the air vent and with the first means defining a plurality of waveguide ducts having dimensions so that the lower cutoff frequency is above the frequency of the waves for which the shield is to be effective, the ducts being longer in length than in width diameter; and second means including a plurality of overlaid metallic wire cloths arranged transversely across the second portion of the air vent and with the second means transverse to the first means and constructed to provide a random pattern of variable direction venting paths through the second means.
Claim 8
Dependent Claim
128 words
Shielding air vent of a shielded room and wherein the air vent includes a bend dividing the air vent into first and second portions comprising: first means extending transversely across the first portion of the air vent and with the first means defining a plurality of waveguide ducts having dimensions so that the lower cutoff frequency is above the frequency of the waves for which the shield is to be effective, the ducts being longer in length than in width diameter; and second means including a plurality of overlaid metallic wire cloths arranged transversely across the second portion of the air vent and with the second means transverse to the first means and constructed to provide a random pattern of variable direction venting paths through the second means.
Claim 9
Dependent Claim
24 words
Shielding air vent as set forth in claim 6, the wire pattern of the cloths of the plurality as superimposed being arranged at random.
Claim 10
Dependent Claim
25 words
Shielding air vent as set forth in claim 6, the first means having a predominant extension transverse to the predominant extension of the second means.
Claim 11
Dependent Claim
31 words
Shielding as set forth in claim 6, the wire cloth layers being corrugated to define a wave pattern so that different incremental cloth portions are oriented to face in different directions.
Claim 12
Dependent Claim
34 words
Shielding air vent as set forth in claim 6, the first means including a pair of multiwaveguide shields, each having a plurality of waveguide elements of a length defining the thickness of the shield.
Claim 13
Dependent Claim
46 words
In a shielding arrangement of the character described, a plurality of overlaid wire mesh cloths with random arrangement of the wires of the several cloths in relation to each other, the cloths being corrugated with alignment of the corrugation grooves and ridges of the several cloths.
Claim 14
Dependent Claim
46 words
In a shielding arrangement of the character described, a plurality of overlaid wire mesh cloths with random arrangement of the wires of the several cloths in relation to each other, the cloths being corrugated with alignment of the corrugation grooves and ridges of the several cloths.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |