US2962802A - Method of applying a wire to the surface of a body along a given pattern - Google Patents

Method of applying a wire to the surface of a body along a given pattern Download PDF

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Publication number
US2962802A
US2962802A US640013A US64001357A US2962802A US 2962802 A US2962802 A US 2962802A US 640013 A US640013 A US 640013A US 64001357 A US64001357 A US 64001357A US 2962802 A US2962802 A US 2962802A
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United States
Prior art keywords
wire
groove
applying
elements
grooves
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Expired - Lifetime
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US640013A
Inventor
Hugh O Pierson
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Goodyear Aircraft Corp
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Goodyear Aircraft Corp
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Priority to US640013A priority Critical patent/US2962802A/en
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Classifications

    • 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
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142—Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface
    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1043—Subsequent to assembly
    • Y10T156/1044—Subsequent to assembly of parallel stacked sheets only
    • Y10T156/1048—Subsequent to assembly of parallel stacked sheets only to form dished or receptacle-like product
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • Y10T156/109—Embedding of laminae within face of additional laminae
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/4987—Elastic joining of parts
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49888—Subsequently coating

Definitions

  • This invention relates to a method to apply a wire to a given surface, or to incorporate the wire with a plastic body in such application as radar reflector grids, electronic circuits, wire heating devices, and similar products.
  • Another object of the invention is to provide a method of the type described characterized by inexpensiveness, speed, lack of requiring skill and excellence of product.
  • a reflector for electrical Waves which includes the steps of providing a plurality of parallel grooves of a depth about half the groove width in a body of metal, treating the body to prevent plastic from adhering thereto, guiding a flexible electro-conductive strand element into proximity with each groove in turn, coating each element during the guiding step with a tacking adhesive cover of a diameter about equal to the groove width, depositing the coated element progressively in each groove, the length thereof, the coating substantially filling the groove, applying sheet-like plastic material over the body and elements, curing the material and the coatings, stripping away the body to leave the elements embedded in the material, and applying a plastic cover sheet over the material and elements to protect the elements.
  • Fig. l is a side elevation of apparatus utilized with one embodiment of the invention.
  • Fig. 2 is a one-half top view of a male mold for forming a radar reflector thereon.
  • Fig. 3 is in larger scale a fragmentary cross-ectional view through the mold showing the grid Wires laid therein.
  • Fig. 4 is a half cross-sectional view of the mold with the reflector plies placed on the mold against the grid wires and ready for curing.
  • Fig. 5 is in over-sized scale a fragmentary crosssectional view through the finished article.
  • Fig. 6 is a cross-sectional view of a grid wire applicator for inserting the wire in the mold grooves.
  • the numeral 1 indicates a male mold, usually made of metal, provided with surface grooves 2 lying in parallel planes and to receive grid wires 3 from a rotatable spool 4 conveniently mounted above the mold.
  • an adapter designated as a whole by the numeral 5 is employed for laying the grid wires 3.
  • the adapter 5 consists of a feed cartridge 6, open at the top, and having a bottom 7 into which fits a readily removable insert 8 carrying a hollow needle 9, similar to a hypodermic needle, having a hole 10 slightly larger than the wire 3 to just coat it with the right amount of States Patent 0 contact pressure adhesive 11, such as a solution of polyvinyl acetate in acetone, which will hold the wire in the groove during the application of plies of resinimpregnated glass fiber cloth to the mold, as hereinafter described.
  • grooves 2 lying in parallel vertical planes are cut into the surface of the mold 1 to receive the grid wires 3.
  • the grooves 2 have a width slightly larger than the diameter of wire 3 and a depth of little more than half the wire diameter which by example may be ten thousandths of one inch.
  • the surface of the mold is covered with wax or like anti-adhesive.
  • a wire 3 is now laid in each groove 2. This is done by the operator holding the end of the adhesive-coated wire in a groove 2 with a finger to stick the end of the wire thereto.
  • the adapter 5 is used like a pencil by guiding the needle 9 along the groove. This is a very (eflicient, practical and time-saving method to insert the wire in its grooves.
  • the required number of resin-impregnated plies 12 of fibre glass cloth are placed over the mold 5 and covered by a thin, transparent, skin 13 which is sealed against the rim of the mold by a ring 14 and clamps 15, whereupon the air enclosed within cover 13 is evacuated through an outlet 1.6 to let atmospheric pressure act upon the plies 12.
  • the plies 12, together with the wires 3 formerly placed into the grooves 2 and now adhering to the plies form, when removed from the mold, the radar reflector, which for protection of the wires 3 is provided with one or more thin plies of resin-impregnated fibre glass cloth 17.
  • These plies also are tightly secured to the reflector by evacuating the air between reflector and protecting plies and then are cured by ultraviolet rays.
  • That method of making a reflector for electrical waves which includes the steps of providing a plurality of parallel grooves of a depth about half the groove width on the outside of dish-like body of metal, coating the body and grooves with an anti-adhesive to prevent plastic from adhering thereto, progressively guiding a flexible electro-conductive strand element into proximity with each groove in turn, progressively coating each each element during the guiding step With a tacking adhesive cover of a diameter about equal to the groove width, depositing the coated element progressively in each groove over the length thereof, the coating substantially filling the groove, covering the body and elements with sheet-like fiberglass cloth and plastic material, evacuating the air between the material and the body, curing the material and the coatings by ultra-violet rays, stripping away the body to leave the elements embedded on the inner surface of the female-shaped material and the coatings adhered thereto, and applying a plastic cover sheet over and into contact with the material and elements to protect the elements.
  • That method of making a reflector for electrical waves which includes the steps of providing a plurality of grooves on the outer surface of a convexly dished body of metal, coating the body and grooves with an antiadhesive to prevent plastic from adhering thereto, guiding a flexible electro-conductive strand element progressively into proximity with each groove in turn, progressively coating each element during the guiding step with a tacking adhesive cover of a diameter about equal to the groove width, depositing the coated element progressively in each groove over the length thereof, the coating substantially filling the groove, covering the body and elements with sheet-like plastic material, evacuating the air between the material and the body, curingthe material and the coatings, stripping away the body to leave the elements embedded in the concave surface of the material, and applying a plastic cover sheet into sealing contact with the material and elements to protect the elements.
  • That method of making a reflector for electrical Waves which includes the steps of providing a dish-shaped body of metal having a plurality of grooves therein, coating the body and grooves with an anti-adhesive to prevent plastic from adhering thereto, progressively guiding a flexible electro-conductive strand element into proximity with each groove in turn, progressively coating each element during the guiding step with a tacking adhesive cover, depositing the coated element progressive in each groove, the coating substantially filling the groove, covering the body and elements with sheetlike plastic material, curing the material and the coatings, stripping away the body to leave the elements embedded in the material and the coatings adhered thereto, and applying a plastic cover sheet in sealing relation with the material and elements to protect the elements.
  • That method of making a reflector for electrical waves which includes the steps of providing a plurality of grooves in a body, coating the body and grooves with an anti-adhesive to prevent plastic from adhering thereto, progressively guiding a flexible electro-conductive strand element into proximity with each groove in turn, progressively coating each element during the guiding step with a tacking adhesive cover, depositing the coated element progressively in each groove, the coating substantially filling the groove, applying sheet-like plastic material over and into sealing contact with the body and elements, curing the material and the coatings, and stripping the body to provide a reflector consisting of the plastic material, the coatings and the strand elements.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Aerials With Secondary Devices (AREA)

Description

Dec. 6, 1960 H. o. PIERSON 2,962,802 METHOD OF APPLYING A WIRE TO THE sumcs OF A BODY mm A GIVEN PATTERN Filed Feb. 13, 1957 ii H l 0 II 1| lllllllJl INVIENTOR. flay/l 0- PM Its an ATTORNEY 2,962,802 Martian or APPLYING A WIRE o THE sunraca OF A BODY ALONG A GIVE PATTERN Hugh 0. Pierson, North Canton, Ohio, assignor to Goodyear Aircraft Corporation, Akron, Ohio, a corporation of Delaware Filed Feb. 13, 1957, so. No. 640,013
4 Claims. c1. 29-1555 This invention relates to a method to apply a wire to a given surface, or to incorporate the wire with a plastic body in such application as radar reflector grids, electronic circuits, wire heating devices, and similar products.
It is the general object of the invention to provide an improved method for making radar reflectors andt-he like and including wires embedded in plastic usually reinforced with fiber glass.
Another object of the invention is to provide a method of the type described characterized by inexpensiveness, speed, lack of requiring skill and excellence of product.
The aforesaid objects of the invention, and other objects which 'will become apparent as the description proceeds are achieved by providing that method of making a reflector for electrical Waves which includes the steps of providing a plurality of parallel grooves of a depth about half the groove width in a body of metal, treating the body to prevent plastic from adhering thereto, guiding a flexible electro-conductive strand element into proximity with each groove in turn, coating each element during the guiding step with a tacking adhesive cover of a diameter about equal to the groove width, depositing the coated element progressively in each groove, the length thereof, the coating substantially filling the groove, applying sheet-like plastic material over the body and elements, curing the material and the coatings, stripping away the body to leave the elements embedded in the material, and applying a plastic cover sheet over the material and elements to protect the elements.
For a better understanding of the invention reference should be had to the accompanying drawings wherein Fig. l is a side elevation of apparatus utilized with one embodiment of the invention.
Fig. 2 is a one-half top view of a male mold for forming a radar reflector thereon.
Fig. 3 is in larger scale a fragmentary cross-ectional view through the mold showing the grid Wires laid therein.
Fig. 4 is a half cross-sectional view of the mold with the reflector plies placed on the mold against the grid wires and ready for curing.
Fig. 5 is in over-sized scale a fragmentary crosssectional view through the finished article.
Fig. 6 is a cross-sectional view of a grid wire applicator for inserting the wire in the mold grooves.
With specific reference to the form of the invention illustrated in the drawing, the numeral 1 indicates a male mold, usually made of metal, provided with surface grooves 2 lying in parallel planes and to receive grid wires 3 from a rotatable spool 4 conveniently mounted above the mold. For laying the grid wires 3, an adapter designated as a whole by the numeral 5 is employed. The adapter 5 consists of a feed cartridge 6, open at the top, and having a bottom 7 into which fits a readily removable insert 8 carrying a hollow needle 9, similar to a hypodermic needle, having a hole 10 slightly larger than the wire 3 to just coat it with the right amount of States Patent 0 contact pressure adhesive 11, such as a solution of polyvinyl acetate in acetone, which will hold the wire in the groove during the application of plies of resinimpregnated glass fiber cloth to the mold, as hereinafter described.
In applying this invention, grooves 2 lying in parallel vertical planes are cut into the surface of the mold 1 to receive the grid wires 3. The grooves 2 have a width slightly larger than the diameter of wire 3 and a depth of little more than half the wire diameter which by example may be ten thousandths of one inch. Now the surface of the mold is covered with wax or like anti-adhesive. A wire 3 is now laid in each groove 2. This is done by the operator holding the end of the adhesive-coated wire in a groove 2 with a finger to stick the end of the wire thereto. Whereupon the adapter 5 is used like a pencil by guiding the needle 9 along the groove. This is a very (eflicient, practical and time-saving method to insert the wire in its grooves.
Next the required number of resin-impregnated plies 12 of fibre glass cloth are placed over the mold 5 and covered by a thin, transparent, skin 13 which is sealed against the rim of the mold by a ring 14 and clamps 15, whereupon the air enclosed within cover 13 is evacuated through an outlet 1.6 to let atmospheric pressure act upon the plies 12. After curing the resin in the plies, for example at low temperature, by ultraviolet rays, the plies 12, together with the wires 3 formerly placed into the grooves 2 and now adhering to the plies, form, when removed from the mold, the radar reflector, which for protection of the wires 3 is provided with one or more thin plies of resin-impregnated fibre glass cloth 17. These plies also are tightly secured to the reflector by evacuating the air between reflector and protecting plies and then are cured by ultraviolet rays.
From the aforesaid it will be recognized that the objects of this invention are fully achiever for obtaining a product of highest quality and performance.
While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.
What is claimed:
1. That method of making a reflector for electrical waves which includes the steps of providing a plurality of parallel grooves of a depth about half the groove width on the outside of dish-like body of metal, coating the body and grooves with an anti-adhesive to prevent plastic from adhering thereto, progressively guiding a flexible electro-conductive strand element into proximity with each groove in turn, progressively coating each each element during the guiding step With a tacking adhesive cover of a diameter about equal to the groove width, depositing the coated element progressively in each groove over the length thereof, the coating substantially filling the groove, covering the body and elements with sheet-like fiberglass cloth and plastic material, evacuating the air between the material and the body, curing the material and the coatings by ultra-violet rays, stripping away the body to leave the elements embedded on the inner surface of the female-shaped material and the coatings adhered thereto, and applying a plastic cover sheet over and into contact with the material and elements to protect the elements.
2. That method of making a reflector for electrical waves which includes the steps of providing a plurality of grooves on the outer surface of a convexly dished body of metal, coating the body and grooves with an antiadhesive to prevent plastic from adhering thereto, guiding a flexible electro-conductive strand element progressively into proximity with each groove in turn, progressively coating each element during the guiding step with a tacking adhesive cover of a diameter about equal to the groove width, depositing the coated element progressively in each groove over the length thereof, the coating substantially filling the groove, covering the body and elements with sheet-like plastic material, evacuating the air between the material and the body, curingthe material and the coatings, stripping away the body to leave the elements embedded in the concave surface of the material, and applying a plastic cover sheet into sealing contact with the material and elements to protect the elements.
3. That method of making a reflector for electrical Waves which includes the steps of providing a dish-shaped body of metal having a plurality of grooves therein, coating the body and grooves with an anti-adhesive to prevent plastic from adhering thereto, progressively guiding a flexible electro-conductive strand element into proximity with each groove in turn, progressively coating each element during the guiding step with a tacking adhesive cover, depositing the coated element progressive in each groove, the coating substantially filling the groove, covering the body and elements with sheetlike plastic material, curing the material and the coatings, stripping away the body to leave the elements embedded in the material and the coatings adhered thereto, and applying a plastic cover sheet in sealing relation with the material and elements to protect the elements.
4. That method of making a reflector for electrical waves which includes the steps of providing a plurality of grooves in a body, coating the body and grooves with an anti-adhesive to prevent plastic from adhering thereto, progressively guiding a flexible electro-conductive strand element into proximity with each groove in turn, progressively coating each element during the guiding step with a tacking adhesive cover, depositing the coated element progressively in each groove, the coating substantially filling the groove, applying sheet-like plastic material over and into sealing contact with the body and elements, curing the material and the coatings, and stripping the body to provide a reflector consisting of the plastic material, the coatings and the strand elements.
References Cited in the file of this patent UNITED STATES PATENTS 359,205 Curtis et a1 Mar. 8, 1887 1,580,953 Bremer Apr. 13, 1926 2,282,759 Gavitt May 12, 1942 2,334,671 Gibbons Nov. 16, 1943 2,431,045 Johnson Nov. 18, 1947 2,447,541 Sabee et a1 Aug. 24, 1948 2,459,605 Warnken Jan. 18, 1949 2,508,456 Gustafsson May 23, 1950 2,543,384 Squier Feb. 27, 1951 2,710,909 Logan et al June 14, 1955
US640013A 1957-02-13 1957-02-13 Method of applying a wire to the surface of a body along a given pattern Expired - Lifetime US2962802A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639193A (en) * 1968-06-03 1972-02-01 Gen Alarm Corp Apparatus for forming a wiring system
US3713947A (en) * 1970-12-16 1973-01-30 Gen Alarm Corp Wiring method
FR2302603A1 (en) * 1975-02-28 1976-09-24 Trw Inc REFLECT MANUFACTURING PROCESS
US4156308A (en) * 1978-04-20 1979-05-29 Gebhart Helen L Method of making a decorative article from pine needles
DE202007007833U1 (en) * 2007-06-01 2008-10-09 eltherm Elektrowärmetechnik GmbH Radar-reflecting frame element

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US359205A (en) * 1887-03-08 best available cop
US1580953A (en) * 1925-02-16 1926-04-13 Bremer Tully Mfg Company Curved spirally-wound coil and method of producing the same
US2282759A (en) * 1940-08-03 1942-05-12 Gavitt Mfg Company Antenna loop
US2334671A (en) * 1942-02-06 1943-11-16 Baldwin Locomotive Works Machine for making electrical strain gauges
US2431045A (en) * 1943-10-20 1947-11-18 Westinghouse Electric Corp Method of winding coils
US2447541A (en) * 1945-01-29 1948-08-24 Sabee Method of making plastic structure
US2459605A (en) * 1945-12-04 1949-01-18 Warnken Elmer Induction coil
US2508456A (en) * 1947-09-25 1950-05-23 Arnold U Huggenberger Electric strain gauge
US2543384A (en) * 1948-03-29 1951-02-27 Honeywell Regulator Co Hygroscopic control device
US2710909A (en) * 1953-11-16 1955-06-14 Richard W Logan Electric heating element

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US359205A (en) * 1887-03-08 best available cop
US1580953A (en) * 1925-02-16 1926-04-13 Bremer Tully Mfg Company Curved spirally-wound coil and method of producing the same
US2282759A (en) * 1940-08-03 1942-05-12 Gavitt Mfg Company Antenna loop
US2334671A (en) * 1942-02-06 1943-11-16 Baldwin Locomotive Works Machine for making electrical strain gauges
US2431045A (en) * 1943-10-20 1947-11-18 Westinghouse Electric Corp Method of winding coils
US2447541A (en) * 1945-01-29 1948-08-24 Sabee Method of making plastic structure
US2459605A (en) * 1945-12-04 1949-01-18 Warnken Elmer Induction coil
US2508456A (en) * 1947-09-25 1950-05-23 Arnold U Huggenberger Electric strain gauge
US2543384A (en) * 1948-03-29 1951-02-27 Honeywell Regulator Co Hygroscopic control device
US2710909A (en) * 1953-11-16 1955-06-14 Richard W Logan Electric heating element

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639193A (en) * 1968-06-03 1972-02-01 Gen Alarm Corp Apparatus for forming a wiring system
US3713947A (en) * 1970-12-16 1973-01-30 Gen Alarm Corp Wiring method
FR2302603A1 (en) * 1975-02-28 1976-09-24 Trw Inc REFLECT MANUFACTURING PROCESS
US4156308A (en) * 1978-04-20 1979-05-29 Gebhart Helen L Method of making a decorative article from pine needles
DE202007007833U1 (en) * 2007-06-01 2008-10-09 eltherm Elektrowärmetechnik GmbH Radar-reflecting frame element

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