US2463517A - Air-borne corner reflector - Google Patents

Air-borne corner reflector Download PDF

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Publication number
US2463517A
US2463517A US602644A US60264445A US2463517A US 2463517 A US2463517 A US 2463517A US 602644 A US602644 A US 602644A US 60264445 A US60264445 A US 60264445A US 2463517 A US2463517 A US 2463517A
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balloon
reflector
collapsible
network
corner reflector
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US602644A
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Chromak Leon
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/18—Reflecting surfaces; Equivalent structures comprising plurality of mutually inclined plane surfaces, e.g. corner reflector
    • H01Q15/20—Collapsible reflectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S52/00—Static structures, e.g. buildings
    • Y10S52/10—Polyhedron

Definitions

  • This invention relates to a balloon with an enclosed radar reflector.
  • the illustrated embodiment of the invention is a combined collapsible balloon and radar corner reflector assembly which is compact and which may be inflated by gas to operative condition.
  • gas gas to operative condition.
  • hydrogen or helium are suitable gases for inflating the baloon assembly.
  • the reflector unit is completely enclosed within the balloon and is secured at spaced points about its inner periphery.
  • the refiector may conveniently be made with three pieces of electrically conductive material intersecting or cut so that their planes make right angles with each other and all pass through a common geometrical center to form eight sections.
  • the conductive material may be elastic'knitted, woven, or other material naturally, or treated to render it, conductive, or thin metallic sheet material and the like.
  • the present improvements eliminate the drag caused by the use of a separate suspended reflector unit and enables the use of a very light-weight reflector.
  • the reflector can be more fragile than previously, as it is protected against weather by the rubber balloon structure. It is held in operative position within the balloon by the gas pressure against the inside of the balloon.
  • While the invention is of paramount importance in ascending balloon assemblies, it may be navigation.
  • the weight of a rain-soaked or ladened reflector adds to the drag of separate units and in the latter case the protection to the reflector afforded by the balloon multiplies its life several times.
  • Upper wind velocities i. e., at elevations of from 30,000 to 40,000 yards, heretofore unobtainable, may be recorded by use of the present invention. With prior devices such readings could not be obtained because these heights were not attained by the balloon and unit or at least not while it remained
  • the balloon is made of electrically non-conducting material.
  • the device being collapsible can be packed into a small space.
  • the elasticity of the supports and/or the reflector unit itself provides for the usual expansion of the ascending balloon.
  • the unit does not cut off the balloon into isolated sections and accordingly it may be filled with gas through a single port. I prefer to seal the balloon after the reflector unit is secured in position.
  • the seal may be a separate piece as illustrated, or may include the intake port.
  • a typical baloon will be about six (6) feet in diameter, although a such smaller or larger one may be used.
  • the points of the reflector suriaces are joined by rubber bands, as by spot vuloanization.
  • the use of rubber bands or elastic reflector surfaces is to allow for the usual expansion of a rubber balloon as it attains great height with the resulting low atmospheric pressure.
  • An object of this invention is to provide a combined balloon and enclosed radar reflector unit. 1
  • Another object is to provide a unitary structure of light weight which protects the reflector unit against the weather and increases the rate of ascent and altiude attained for a given amount of gas or size of the unit.
  • Another object is to provide an enclosed .radar corner reflector with means to compensate for the lower atmospheric pressure at high altitudes.
  • a 3 or 6 foot diameter or other size balloon it! which may be rubber, paper or cloth treated to render it non-porous, has a gas intake extension or port it which may be sealed by an convenient means, such as cord l2.
  • the reflector device may be assembled in position by inserting it through an opening which is later closed as by a vulcanized seal E3.
  • the reflector unit is collapsible and in operative position forms three intersecting surfaces, l4, l5, and i6, at substantially right angles to each other.
  • the planes of each of the surfaces has a common geometrical center at H and, as
  • ⁇ will be understood, form eight (8) three-sided or trihedral sections. If the figure be turned in either direction about its vertical axis the radar corner reflector portion will be the same as shown.
  • the surfaces M, l5 and It may be sewn or otherwise joined together.
  • the six points of the unit are each connected to rubber bands, such as l8, I9, 20 and 2
  • the reflector unit may vary from the illustrated embodiment.
  • the sides may be curved instead of straight, the surfaces may be elastic knit goods, with cords substituted for the rubber bands, and other substitutions within the skill of those trained in the art may be made.
  • This invention may be made or used by or for the Government of the United States for governmental purposes without the payment to me of any royalties thereon or therefor.
  • a collapsible inflatable windsounding balloon an enclosed collapsible electrically conductive network
  • means including a multiplicity of elastic supports for securing said network in operative position when the balloon is inflated, said supports being provided to yield with the expansion of the balloon as it attains hi h altitudes or is subjected to high internal pressure, whereby said network is held rigidly in operative position.
  • a collapsible windsounding balloon an enclosed collapsible electrically conductive network, said network having eight threesided sections the sides of which are at substantially right angles to each other and form six points in all, elastic securing means individually connected to the outer ends of said sections and to the inside of the windsounding balloon.
  • a selfcontained unit comprising a collapsible inflatable windsounding balloon having a gas intake port and containing therein an enclosed collapsible electrically conductive network comprising eight three-sided sections substantially mounted mutually perpendicular to one another forming six points each secured by elastic means to the in- 4 side of said balloon, said formed network reflecting impinging ultra short electromagnetic waves toward their source.
  • An airborne reflector for ultra short mac- 5 netic waves comprising a protective, flexible, balloon, an electrically conductive, collapsible, multiplanar reflector network yieldably secured within said "balloon, the aforementioned network being held in an uncollapsed position when the balloon is inflated, whereby impinging ultra short magnetic waves are reflected towards their source.
  • An airborne reflector for ultra short magnetic waves comprising an unmanned, free floating, flexible, balloon, an electrically conductive,
  • collapsible, multiplanar reflector network yieldably secured within said balloon, the aforementioned network being held in an uncollapsed position when the balloon is inflated whereby impinging ultra short magnetic waves are reflected towards their source.
  • An airborne reflector for ultra short magnetic waves comprising, an inflatable, flexible, free floating balloon having an intake port for 0 gas, an electrically conductive, collapsible, net
  • said network being three plane surfaces normal to each other so as to form eight three-sided sections, the aforementioned network being held in an uncollapsed position when the balloon is inflated, whereby impinging ultra short magnetic waves are reflected towards their source.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)

Description

March 8, 1949. CHRQMAK 2,463,517
AIRBORNE CORNER REFLECTOR Filed- June 30, 1945 Qwem M LEON CHROMAK in recording range,
Patented Mar. 8, 1949 UNITED STATES "PATENT orrica 6 Claims.
amended April 30, 1928; 370 0. G. 757) This invention relates to a balloon with an enclosed radar reflector.
More particularly, the illustrated embodiment of the invention is a combined collapsible balloon and radar corner reflector assembly which is compact and which may be inflated by gas to operative condition. As will be understood, hydrogen or helium are suitable gases for inflating the baloon assembly. The reflector unit is completely enclosed within the balloon and is secured at spaced points about its inner periphery. The refiector may conveniently be made with three pieces of electrically conductive material intersecting or cut so that their planes make right angles with each other and all pass through a common geometrical center to form eight sections. The conductive material may be elastic'knitted, woven, or other material naturally, or treated to render it, conductive, or thin metallic sheet material and the like.
Prior to these improvements, it was the practice to suspend a radar corner reflector from a balloon prior to ascent. This prior construction creates a drag which importantly restricts the rate of ascent and the altitude attained by units of convenient size. In addition to the wind or air resistance, of prior constructions, the additional weight of a frame work for the reflector adds to the total drag.
The present improvements eliminate the drag caused by the use of a separate suspended reflector unit and enables the use of a very light-weight reflector. The reflector can be more fragile than previously, as it is protected against weather by the rubber balloon structure. It is held in operative position within the balloon by the gas pressure against the inside of the balloon.
While the invention is of paramount importance in ascending balloon assemblies, it may be navigation. In the former case, the weight of a rain-soaked or ladened reflector adds to the drag of separate units and in the latter case the protection to the reflector afforded by the balloon multiplies its life several times. Upper wind velocities, i. e., at elevations of from 30,000 to 40,000 yards, heretofore unobtainable, may be recorded by use of the present invention. With prior devices such readings could not be obtained because these heights were not attained by the balloon and unit or at least not while it remained As will be understood, the balloon is made of electrically non-conducting material.
The device being collapsible can be packed into a small space. The elasticity of the supports and/or the reflector unit itself provides for the usual expansion of the ascending balloon. The unit does not cut off the balloon into isolated sections and accordingly it may be filled with gas through a single port. I prefer to seal the balloon after the reflector unit is secured in position. The seal may be a separate piece as illustrated, or may include the intake port.
A typical baloon will be about six (6) feet in diameter, although a such smaller or larger one may be used. The points of the reflector suriaces are joined by rubber bands, as by spot vuloanization. The use of rubber bands or elastic reflector surfaces is to allow for the usual expansion of a rubber balloon as it attains great height with the resulting low atmospheric pressure.
An object of this invention is to provide a combined balloon and enclosed radar reflector unit. 1
Another object is to provide a unitary structure of light weight which protects the reflector unit against the weather and increases the rate of ascent and altiude attained for a given amount of gas or size of the unit.
Another object is to provide an enclosed .radar corner reflector with means to compensate for the lower atmospheric pressure at high altitudes.
These and other objects of invention will be manifest from a consideration of the description, claims and drawings, in which the figure is a sectional view of the inflated balloon and enclosed radar reflector in operative position ready to be launched.
Referring to the drawing, a 3 or 6 foot diameter or other size balloon it! which may be rubber, paper or cloth treated to render it non-porous, has a gas intake extension or port it which may be sealed by an convenient means, such as cord l2. The reflector device may be assembled in position by inserting it through an opening which is later closed as by a vulcanized seal E3.
The reflector unit is collapsible and in operative position forms three intersecting surfaces, l4, l5, and i6, at substantially right angles to each other. The planes of each of the surfaces has a common geometrical center at H and, as
\ will be understood, form eight (8) three-sided or trihedral sections. If the figure be turned in either direction about its vertical axis the radar corner reflector portion will be the same as shown. The surfaces M, l5 and It may be sewn or otherwise joined together. The six points of the unit are each connected to rubber bands, such as l8, I9, 20 and 2| which in turn are spot vulcanized or otherwise connected to the inside of the bal- Additional rubber bands loon as at 22, 23, 24, 25. and connections may be used if desired.
The reflector unit may vary from the illustrated embodiment. For example, the sides may be curved instead of straight, the surfaces may be elastic knit goods, with cords substituted for the rubber bands, and other substitutions within the skill of those trained in the art may be made.
It will be seen that I have eliminated the drags oi. separate reflector units and the weight of their frame structure and have provided a means for attaining great height with a higher rate of ascent than possible with prior devices of like size. I have done this without impairing the efflciency of the reflector unit.
Having described my invention in a preferred embodiment, I wish it to be understood that any radar reflector such as might be used in radio range detection work with a fixed or ascending balloon is contemplated to be within the scope oi the present improvements.
This invention may be made or used by or for the Government of the United States for governmental purposes without the payment to me of any royalties thereon or therefor.
What I claim is:
1. In combination, a collapsible inflatable windsounding balloon, an enclosed collapsible electrically conductive network, means including a multiplicity of elastic supports for securing said network in operative position when the balloon is inflated, said supports being provided to yield with the expansion of the balloon as it attains hi h altitudes or is subjected to high internal pressure, whereby said network is held rigidly in operative position.
2. In combination, a collapsible windsounding balloon, an enclosed collapsible electrically conductive network, said network having eight threesided sections the sides of which are at substantially right angles to each other and form six points in all, elastic securing means individually connected to the outer ends of said sections and to the inside of the windsounding balloon.
'3. In a radiant energy reflection system a selfcontained unit comprising a collapsible inflatable windsounding balloon having a gas intake port and containing therein an enclosed collapsible electrically conductive network comprising eight three-sided sections substantially mounted mutually perpendicular to one another forming six points each secured by elastic means to the in- 4 side of said balloon, said formed network reflecting impinging ultra short electromagnetic waves toward their source.
4. An airborne reflector for ultra short mac- 5 netic waves comprising a protective, flexible, balloon, an electrically conductive, collapsible, multiplanar reflector network yieldably secured within said "balloon, the aforementioned network being held in an uncollapsed position when the balloon is inflated, whereby impinging ultra short magnetic waves are reflected towards their source.
5. An airborne reflector for ultra short magnetic waves comprising an unmanned, free floating, flexible, balloon, an electrically conductive,
collapsible, multiplanar reflector network yieldably secured within said balloon, the aforementioned network being held in an uncollapsed position when the balloon is inflated whereby impinging ultra short magnetic waves are reflected towards their source.
6. An airborne reflector for ultra short magnetic waves comprising, an inflatable, flexible, free floating balloon having an intake port for 0 gas, an electrically conductive, collapsible, net
work yieldably secured within said balloon, said network being three plane surfaces normal to each other so as to form eight three-sided sections, the aforementioned network being held in an uncollapsed position when the balloon is inflated, whereby impinging ultra short magnetic waves are reflected towards their source.
LEON CHROMAK.
REFERENCES CITED The following references are of record in the Number Name Date 1,007,405 Wagner et al. Oct. 31, 1911 1 1,031,148 Ranza July 2, 1912 1,546,803 Stemberg July 21, 1925 2,027,367 Blair Jan. 14, 1936 2,151,336 Scharlau Mar. 21, 1939 2,396,112 Morgan Mar. 5, 1946 2,406,302 Nelson Aug. 20, 1946 FOREIGN PATENTS Number Country Date 3,773 Great Britain 1886
US602644A 1945-06-30 1945-06-30 Air-borne corner reflector Expired - Lifetime US2463517A (en)

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Cited By (61)

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Publication number Priority date Publication date Assignee Title
US2560218A (en) * 1950-04-22 1951-07-10 Rca Corp Submarine antenna structure
US2576255A (en) * 1948-06-15 1951-11-27 Emmett L Hudspeth Reflecting fabric
US2666600A (en) * 1951-06-25 1954-01-19 Gen Mills Inc Balloon and method of making
US2746035A (en) * 1951-06-04 1956-05-15 Virginia T Norwood Radar reflector
US2756948A (en) * 1952-12-05 1956-07-31 Winzen Res Inc Skin stressed balloon
US2814038A (en) * 1953-07-29 1957-11-19 Westinghouse Electric Corp Lightweight antennas
US2821396A (en) * 1955-10-26 1958-01-28 Leonard W Seeley Aerial tow target
US2869120A (en) * 1956-09-17 1959-01-13 Del Mar Eng Lab Tow target having combustion signal means
US2888675A (en) * 1956-02-07 1959-05-26 Martin Co Water borne inflatable radar reflector unit
US2913726A (en) * 1956-10-29 1959-11-17 Westinghouse Electric Corp Inflatable antenna structure
US2967677A (en) * 1957-05-13 1961-01-10 Winzen Res Inc Apparatus for launching balloons
US3005987A (en) * 1957-02-19 1961-10-24 Westinghouse Electric Corp Inflatable antenna assembly
US3010103A (en) * 1956-01-16 1961-11-21 Del Mar Eng Lab Radar reflective tow target
US3016532A (en) * 1957-02-25 1962-01-09 Del Mar Eng Lab Tow target
DE1129192B (en) * 1958-06-03 1962-05-10 Dunlop Rubber Co Radar reflector
US3047860A (en) * 1957-11-27 1962-07-31 Austin B Swallow Two ply electromagnetic energy reflecting fabric
US3056131A (en) * 1956-10-01 1962-09-25 Collins Radio Co Inflatable antenna
US3086202A (en) * 1956-10-22 1963-04-16 Del Mar Eng Lab Infrared emitting tow target
DE1150719B (en) * 1958-05-03 1963-06-27 Dunlop Rubber Co Collapsible radio wave reflector
US3103662A (en) * 1958-06-03 1963-09-10 Dunlop Rubber Co Inflatable eight-corner reflector
US3121227A (en) * 1956-01-16 1964-02-11 Dwaine R Franklin Frangible tow target
DE1162893B (en) * 1959-07-02 1964-02-13 Dunlop Rubber Co Multiple triple reflector for electric waves
US3128463A (en) * 1955-12-28 1964-04-07 Del Mar Eng Lab Frangible target
US3137852A (en) * 1954-11-26 1964-06-16 Del Mar Engineering Lab Inc Frangible target
US3138798A (en) * 1957-07-18 1964-06-23 Anderson Greenwood & Co Opposed corner radar reflector assembly
US3229291A (en) * 1961-01-30 1966-01-11 Aria Paul S Dell Ship simulator
US3283328A (en) * 1963-11-13 1966-11-01 Bendix Corp Sounding balloon and target assembly
US3390409A (en) * 1965-09-13 1968-07-02 Hydro Space Corp Lifesaving buoy
US3412957A (en) * 1965-09-24 1968-11-26 Arthur D. Struble Jr. Inflated balloon
US3521836A (en) * 1968-08-06 1970-07-28 Arthur D Struble Jr Inflated buoyant wing
US3671965A (en) * 1970-04-03 1972-06-20 Us Navy Rapid deployment corner reflector
DE3032085A1 (en) * 1980-08-26 1982-04-08 Autoflug Gmbh, 2084 Rellingen Passive radar-effective direction finding unit - uses inflatable shell with internal metallised radar reflector
EP0148635A3 (en) * 1984-01-12 1987-04-29 Plessey Overseas Limited Radar reflector
EP0182274A3 (en) * 1984-11-13 1987-05-06 Schaefer Marlene Inflatable radar reflector
US4837955A (en) * 1988-03-07 1989-06-13 Biodot International, Incorporated Balloon structure
US4878335A (en) * 1988-08-31 1989-11-07 Hardy Donald J Methods and apparatus for inserting objects within balloons
US4974393A (en) * 1989-03-21 1990-12-04 Maxim Marketing, Inc. Apparatus and method for inserting objects into balloons
US4980688A (en) * 1959-09-30 1990-12-25 The United States Of America As Represented By The Secretary Of The Navy Regenerator
WO1991004589A1 (en) * 1989-09-23 1991-04-04 Dowty Woodville Polymer Limited Detection of airborne craft
WO1991009434A1 (en) * 1988-07-13 1991-06-27 Baco Industrier A/S A corner reflector for use in a radar balloon
US5041047A (en) * 1990-06-28 1991-08-20 Casale Angelo J Balloon with additional interior display surfaces
WO1991016735A1 (en) * 1990-04-12 1991-10-31 Colebrand Limited Reflector
US5088267A (en) * 1989-08-25 1992-02-18 Gee Anthony L Apparatus and methods for placing an object inside an inflated balloon
US5102365A (en) * 1991-04-08 1992-04-07 Team Worldwide Corp. Inflatable article
US5102364A (en) * 1990-01-19 1992-04-07 Odyssey, Inc. Balloon with elastic elongate member supporting a decorative structure
US5215492A (en) * 1989-07-28 1993-06-01 Kubiatowicz James F Toy balloon with cool illumination
WO1995000981A1 (en) * 1993-06-25 1995-01-05 Forsvarets Forskningsinstitutt Force controlling suspension of an object in a balloon
US5457472A (en) * 1992-06-11 1995-10-10 Baco Industrier A/S Corner reflector for use in a radar balloon
US5508704A (en) * 1994-06-16 1996-04-16 Hann; Lenn R. Method and apparatus for modulating a doppler radar signal
US5743786A (en) * 1996-05-30 1998-04-28 Lindsey; Alan Balloon face polyhedra
US5940023A (en) * 1998-04-29 1999-08-17 Pioneer Aerospace Corporation Parachute apparatus having enhanced radar reflective characteristics
US5969660A (en) * 1993-09-30 1999-10-19 S E Ventures, Inc. Inflatable radar reflectors
US6570545B1 (en) 2001-12-06 2003-05-27 The United States Of America As Represented By The Secretary Of The Navy Apparatus and process for reflecting radar waves
US20030137441A1 (en) * 2002-01-18 2003-07-24 Lionel Garon Electromagnetic reflector
US6742903B2 (en) * 2001-07-25 2004-06-01 Francis X. Canning Arrangement of corner reflectors for a nearly omnidirectional return
US6864858B1 (en) 2001-12-06 2005-03-08 The United States Of America As Represented By The Secretary Of The Navy Radar reflecting rescue device
US20100300347A1 (en) * 2007-06-22 2010-12-02 Korea Maritine & Ocean Engineering Research Instit ute Emergency position indicating device using radar cross section characteristics
US7847721B1 (en) 1996-03-20 2010-12-07 Forsvarets Materielverk Decoy for deceiving radar systems, especially doppler radar systems
US20130009801A1 (en) * 1996-03-20 2013-01-10 Conny Carlsson Decoy for Deceiving Doppler Radar Systems
US20150048572A1 (en) * 2013-03-29 2015-02-19 American Pacific Plastic Fabricators, Inc. Buoyant target with laser reflectivity
US20190252791A1 (en) * 2018-02-09 2019-08-15 The Boeing Company Inflatable Radar Decoy System and Method

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US1546803A (en) * 1924-12-15 1925-07-21 Oscar H Sternberg Buoying device for aeroplanes
US2027367A (en) * 1932-02-15 1936-01-14 William R Blair System of determining meteorological conditions by radio
US2151336A (en) * 1934-07-05 1939-03-21 Telefunken Gmbh Radio signaling apparatus
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Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576255A (en) * 1948-06-15 1951-11-27 Emmett L Hudspeth Reflecting fabric
US2560218A (en) * 1950-04-22 1951-07-10 Rca Corp Submarine antenna structure
US2746035A (en) * 1951-06-04 1956-05-15 Virginia T Norwood Radar reflector
US2666600A (en) * 1951-06-25 1954-01-19 Gen Mills Inc Balloon and method of making
US2756948A (en) * 1952-12-05 1956-07-31 Winzen Res Inc Skin stressed balloon
US2814038A (en) * 1953-07-29 1957-11-19 Westinghouse Electric Corp Lightweight antennas
US3137852A (en) * 1954-11-26 1964-06-16 Del Mar Engineering Lab Inc Frangible target
US2821396A (en) * 1955-10-26 1958-01-28 Leonard W Seeley Aerial tow target
US3128463A (en) * 1955-12-28 1964-04-07 Del Mar Eng Lab Frangible target
US3010103A (en) * 1956-01-16 1961-11-21 Del Mar Eng Lab Radar reflective tow target
US3121227A (en) * 1956-01-16 1964-02-11 Dwaine R Franklin Frangible tow target
US2888675A (en) * 1956-02-07 1959-05-26 Martin Co Water borne inflatable radar reflector unit
US2869120A (en) * 1956-09-17 1959-01-13 Del Mar Eng Lab Tow target having combustion signal means
US3056131A (en) * 1956-10-01 1962-09-25 Collins Radio Co Inflatable antenna
US3086202A (en) * 1956-10-22 1963-04-16 Del Mar Eng Lab Infrared emitting tow target
US2913726A (en) * 1956-10-29 1959-11-17 Westinghouse Electric Corp Inflatable antenna structure
US3005987A (en) * 1957-02-19 1961-10-24 Westinghouse Electric Corp Inflatable antenna assembly
US3016532A (en) * 1957-02-25 1962-01-09 Del Mar Eng Lab Tow target
US2967677A (en) * 1957-05-13 1961-01-10 Winzen Res Inc Apparatus for launching balloons
US3138798A (en) * 1957-07-18 1964-06-23 Anderson Greenwood & Co Opposed corner radar reflector assembly
US3047860A (en) * 1957-11-27 1962-07-31 Austin B Swallow Two ply electromagnetic energy reflecting fabric
DE1150719B (en) * 1958-05-03 1963-06-27 Dunlop Rubber Co Collapsible radio wave reflector
US3130406A (en) * 1958-05-03 1964-04-21 Dunlop Rubber Co Radar reflectors and life rafts incorporating same
DE1129192B (en) * 1958-06-03 1962-05-10 Dunlop Rubber Co Radar reflector
US3103662A (en) * 1958-06-03 1963-09-10 Dunlop Rubber Co Inflatable eight-corner reflector
DE1162893B (en) * 1959-07-02 1964-02-13 Dunlop Rubber Co Multiple triple reflector for electric waves
US4980688A (en) * 1959-09-30 1990-12-25 The United States Of America As Represented By The Secretary Of The Navy Regenerator
US3229291A (en) * 1961-01-30 1966-01-11 Aria Paul S Dell Ship simulator
US3283328A (en) * 1963-11-13 1966-11-01 Bendix Corp Sounding balloon and target assembly
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