US3061502A - Method of producing weatherproof insulating panels - Google Patents

Method of producing weatherproof insulating panels Download PDF

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Publication number
US3061502A
US3061502A US795966A US79596659A US3061502A US 3061502 A US3061502 A US 3061502A US 795966 A US795966 A US 795966A US 79596659 A US79596659 A US 79596659A US 3061502 A US3061502 A US 3061502A
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US
United States
Prior art keywords
boards
board
sheet
rubber
glass fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US795966A
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English (en)
Inventor
Macdonald Donald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Owens Corning
Original Assignee
Owens Corning Fiberglas Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE588078D priority Critical patent/BE588078A/xx
Application filed by Owens Corning Fiberglas Corp filed Critical Owens Corning Fiberglas Corp
Priority to US795966A priority patent/US3061502A/en
Priority to GB6526/60A priority patent/GB899390A/en
Priority to DEO7259A priority patent/DE1120635B/de
Application granted granted Critical
Publication of US3061502A publication Critical patent/US3061502A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/20—Pills, tablets, discs, rods
    • A61K9/28—Dragees; Coated pills or tablets, e.g. with film or compression coating
    • A61K9/2806—Coating materials
    • A61K9/2833—Organic macromolecular compounds
    • A61K9/2853—Organic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, polyethylene oxide, poloxamers, poly(lactide-co-glycolide)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/20—Pills, tablets, discs, rods
    • A61K9/28—Dragees; Coated pills or tablets, e.g. with film or compression coating
    • A61K9/2886—Dragees; Coated pills or tablets, e.g. with film or compression coating having two or more different drug-free coatings; Tablets of the type inert core-drug layer-inactive layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/12—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat
    • 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
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • 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
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • Y10T156/1067—Continuous longitudinal slitting
    • 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
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1084—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing of continuous or running length bonded web
    • 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
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1084—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing of continuous or running length bonded web
    • Y10T156/1087—Continuous longitudinal slitting
    • 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
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/1317—Means feeding plural workpieces to be joined
    • Y10T156/1343—Cutting indefinite length web after assembly with discrete article

Definitions

  • Glass fiber products have been used formerly as roofing materials, for instance, bonded fiber mats have been rolled over existing roofs and coated with asphalt or similar waterproofing materials. Also roof decks of glass fiber boards combined with asphalt or other waterproofing materials have been used. There is a real need for an improved insulating board having better Weatherproofing properties than presently available; although various attempts to improve weatherproofing properties have been made, no answer to this problem of how to extend the life of a roof has been suggested.
  • FIGURE 1 is an elevationalview of equipment used to prepare a glass fabric utilized in the invention
  • FIGURE 2 is a perspective view of the calendering operation carried out to prepare a glass fabric facing
  • FIGURE 3 is a schematic view of the calendering operation
  • FIGURE 4 is a perspective view showing the fabric after it is laminated with a layer of an elastomeric substance
  • FIGURE 5 is an elevational view of apparatus used to combine fibrous glass base material with the glass fabric facing to form the final product
  • FIGURE 6 is a view taken on line 66 of FIGURE 5;
  • FIGURE 7 is an elevational view of another form of equipment used in combining glass fiber board and glass fabric to produce a final product
  • FIGURE 8 is a view of the final product produced with the equipment of FIGURE 7;
  • FIGURE 9 depicts a typical installation utilizing the product shown in FIGURE 8.
  • FIGURE 10 is a perspective view of a roof installation.
  • the apparatus comprises a let-off stand 10 suitable for holding a roll 11 of glass fabric, idler rolls 12, 12, an immersion roll 13, tank 14, a saturating fluid 15, four-roll calender 16, hopper 17 having a vibrator 18, table 19 and roll-up device 20.
  • the calender also shown in FIGURES 2 and 3, comprises four rolls which are arranged in the conventional manner to sheet-out an elastomeric material prior to laminating the sheet of elastomer with another material such as glass fabric.
  • glass fabric 21 is advanced through a saturating fluid 15 and after air drying or passage through a drying oven (not shown), the fabric 21 passes through the two lowermost rolls of the calender 16 whereupon the fabric is coated with a layer of rubber 22.
  • a suitable material 23 such as roofing granules, mica, metal flake or glass flakes, is applied by the hopper 17 to the surface of the rubber as it passes over table 19.
  • the fabric reinforced rubber sheet 24 cannot be separated as shown in FIGURE 4; this view is presented, however, to show that the product at this stage comprises two components, (1) rubber and (2) glass fabric.
  • a phenolic bonded glass fiber board 25 produced by a steam blowing process such as that disclosed in US. Patent 2,206,058, and having a density of from about 3 to about 12 pounds per cubic foot is advanced upon conveyor 26 while it is sprayed with a solvent solution of a rubber such as polyisobutylene from nozzles 27, 27.
  • the glass fiber board may be produced by any suitable fiber forming process including the steam blowing process, rotary fiber forming process, burnerblown process, or any other conventional process.
  • the fiber forming process is not a part of the present invention, it is very advantageous to place the production equipment shown in FIGURE 5 at the end of the fiber forming apparatus so that the glass fiber board being produced is fed directly into the equipment shown in FIGURE 5 to avert the need of warehousing or palletizing the board.
  • the glass fiber board is directed through oven 28 to remove solvent and dry the sprayed rubber on the board surface.
  • Conveyor 29 then advances the board between driven rolls 30, 31 and the rubber-faced glass fabric 24 produced in the calendering operation (FIGURES 1, 2 and 3) is combined with the glass fiber board.
  • Rubber-faced glass fabric 24 is directed onto the treated surface of the glass fiber board 25 and is adhered thereto by the action of rolls 30, 31.
  • Slitter 33 in conjunction with the grooved roll 34 slits the board and fabric, see FIGURE 6.
  • glass flake 35 a flameproofing pigment, or another suitable material such as roofing granules is sprinkled upon the surface of the board by the action of hopper 36 and vibrator 37.
  • Conveyor 38 advances the slit board into chopping device 39 which cuts the board into the desired lengths.
  • Chopped boards 40 advance over rollers 41, 41 and are stacked upon pallet 42.
  • FIGURE 7 a modified production line is shown which produces a board having suitable flaps of reinforced rubber sheet that extend out beyond the board.
  • Conveyor belt 43, spray nozzles 44 and air drying oven 45 are identical with the equipment shown in FIGURE 5.
  • Chopper 46 is disposed at the exit end of the drying oven and produces boards of suitable length which are advanced on conveyor 47 which is provided with lugs 48, 48. Lugs 48, 48 space the boards prior to advancement between driven rolls 49, 50 whereupon the reinforced rubber sheet is applied to the top surface of the glass fiber boards.
  • Facing sheet 51 may be sprayed with a solvent solution of rubber or the like by the use of a nozzle 52 or a plurality of such nozzles.
  • the boards remain spaced apart and adhere to the facing sheet as they advance through slitter 53.
  • Chopper 54 is synchronized with conveyor 55 in such a manner that the facing sheet is cut at the advanced edge of each of the boards.
  • Facing sheet 51 is sufiiciently wider than the glass fiber boards so that a flap is formed at each side of the advancing boards, see FIGURE 8. After slitting and then chopping with chopper 54, the final boards have a flap at two adjacent sides, see FIGURE 8.
  • FIGURE 9 shows an installation of these boards on a storage tank.
  • Boards 56, 56 are arranged so that the flaps are at the bottom and at the right-hand side of the board when it is installed.
  • the lower flap of each board overlaps the board in the next lower course as shown.
  • the right-hand flap of each board overlaps the adjacent board to cover the vertical abutting edges.
  • These flaps are sealed to the surface sheet of the adjoining board by spraying or wiping the under edge of the flap with a solvent such as gasoline or a suitable cleaning fluid and then the flap is pressed tightly against the adjacent board to establish a water-tight seal.
  • the boards may be secured to the tank by any suitable adhesive or retaining bands can be wrapped about the outer side of the boards after they are put into position. All flashing and seam covers are applied with a suitable adhesive such as polyisobutylene in hexane or other suitable solvent.
  • a suitable adhesive such as polyisobutylene in hexane or other suitable solvent.
  • Boards 57, 57 are provided with flaps at two adjacent sides (bottom and right-hand sides) of the board so that when the boards are assembled as shown, all seams and abutting edges are covered with at least one flap of the rubber-faced glass fabric.
  • the roofing boards may be applied directly over a surface having a fresh coating of asphalt or other suitable weatherproofing material.
  • the rubber used for surfacing the glass fiber boards is preferably polyisobutylene.
  • suitable color pigments can be mixed into the rubber to provide the decorative effect desired in the final installation.
  • Such pigments are well known in the art and readily obtainable.
  • a flameproofing pigment such as aluminum flake, antimony oxide, or others can be rolled into the surface of the sheet during calendering so as to be available for extinguishing surface flame before the elastomeric sheet itself is damaged.
  • the elastomer can also be embossed to provide further decorative effects if this is desired.
  • embossing in addition to providing decorative effects will help tie the elastomer to the glass reinforcement although even without embossing it is impossible to remove the elastomer sheet from the reinforcing fabric.
  • polyisobutylene is especially suited since it has excellent weathering characteristics and is not prohibitively expensive.
  • the fibrous board, bat or base member may comprise other fibers than glass, but glass is especially suited for a weatherproofing product.
  • the fibers of the base member may be bonded with phenol-formaldehyde, urea formaldehyde, melamine formaldehyde, gypsum, magnesium oxy-sulfate, Portland cement or any other suitable binder or mixture of these.
  • the bat or board, in addition to being bonded, may be partly or totally saturated with rubber or asphalt or mixtures of an elastomer and a resinous material prior to the application of the elastomeric surfacing sheet.
  • the saturant should be compatible with the surfacing sheet to promote adhesion therebetween resulting in an integral product.
  • Base members having the indicated densities of from about 3 to 12 pounds per cubic foot vary from rather flexible bats to rather rigid boards. Generally boards are preferred; however, although flexible bats are not the full equivalent of boards, it is sometimes adequate to utilize resilient bats of glass fiber such as those formed by the rotary or centrifugal process which are rigid enough to withstand the load imposed upon the roof Without being crushed permanently since the glass fiber reinforced elastomeric coating member will actually support the load while the resilient bat is temporarily depressed.
  • Method of producing weatherproof panels comprising advancing spaced-apart, bonded glass fiber boards into a working zone, said boards having a sprayed coating of an elastomer on one major surface thereof, applying a facing sheet of reinforced elastomer to the coated surface of the boards, said sheet of reinforced elastomer being of greater width than said glass fiber boards to form a projecting flap at two sides of said fiber boards, slitting each of the advancing, spaced-apart boards at the center and the sheet of reinforced elastomer to form two side by side boards each of which has one projecting flap of reinforced elastomer at a side of the board, and chopping the sheet of reinforced elastomer at leading edges of each of the advancing, spaced-apart boards to provide a second projecting flap of reinforced elastomer on each of the next preceding boards.
  • Method of producing weatherproof insulating boards comprising advancing a continuous glass fiber board into a working zone, chopping the continuous board into separate boards having the desired length, spacing the separate boards one from another as they are advanced, directing a rubber surfacing sheet onto the separated boards as they advance in their spaced apart relationship and pressing said rubber surfacing sheet into adhering engagement with the boards to form spaced apart boards having a continuous surfacing sheet adhered thereto, a part of the surfacing sheet being unsupported, and chopping the rubber surfacing sheet at the intermediate forward edge of each of the advancing board to produce a projecting flap of rubber surfacing sheet on the next preceding advancing board.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Chemical & Material Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Textile Engineering (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Medicinal Preparation (AREA)
  • Laminated Bodies (AREA)
US795966A 1959-02-27 1959-02-27 Method of producing weatherproof insulating panels Expired - Lifetime US3061502A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE588078D BE588078A (en)) 1959-02-27
US795966A US3061502A (en) 1959-02-27 1959-02-27 Method of producing weatherproof insulating panels
GB6526/60A GB899390A (en) 1959-02-27 1960-02-24 Improvements in coated tablets
DEO7259A DE1120635B (de) 1959-02-27 1960-02-26 Verfahren zur Herstellung eines UEberzugsfilms auf Tabletten

Applications Claiming Priority (1)

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US795966A US3061502A (en) 1959-02-27 1959-02-27 Method of producing weatherproof insulating panels

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US3061502A true US3061502A (en) 1962-10-30

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US795966A Expired - Lifetime US3061502A (en) 1959-02-27 1959-02-27 Method of producing weatherproof insulating panels

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BE (1) BE588078A (en))
DE (1) DE1120635B (en))
GB (1) GB899390A (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257258A (en) * 1961-11-24 1966-06-21 D Andrea Angelo Ralph Apparatus for manufacturing frangible closures for containers
US3279594A (en) * 1965-02-04 1966-10-18 Iii George Y Worthington Protective envelope for flat articles and package containing said articles
US3772112A (en) * 1971-03-24 1973-11-13 Textile Cutting Corp Web cutting process
US20040172901A1 (en) * 2002-03-04 2004-09-09 Deming Joseph A. Insulated weather-resistant interlocking roof system and method

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US985140A (en) * 1909-06-25 1911-02-28 Hedley Button Roof or wall covering.
US2057167A (en) * 1933-01-11 1936-10-13 Brown Co Manufacture of impregnated sheet products
US2194958A (en) * 1939-12-08 1940-03-26 American Anode Inc Aqueous dispersion of polymerized hydrocarbon material and method of preparing the same
US2254394A (en) * 1940-09-16 1941-09-02 Nat Automotive Fibres Inc Cutoff applying means
US2301215A (en) * 1939-12-18 1942-11-10 Abbott Coburn Waterproofed material
US2326723A (en) * 1940-12-18 1943-08-10 Carey Philip Mfg Co Roofing
US2454283A (en) * 1943-12-31 1948-11-23 Armstrong Cork Co Sealing element, including a binder consisting of polyisobutylene and factice
GB617067A (en) * 1945-08-08 1949-02-01 Cons Vultee Aircraft Corp Flexible insulating pads
US2495636A (en) * 1944-05-22 1950-01-24 Cons Vultee Aircraft Corp Insulating pad
US2587685A (en) * 1947-02-07 1952-03-04 Bergstein Robert Morris Method for the manufacture of articulated panels
US2700630A (en) * 1952-09-18 1955-01-25 Firestone Tire & Rubber Co Vinyl leather products and process of producing same
US2802764A (en) * 1952-10-08 1957-08-13 Owens Corning Fiberglass Corp Acoustical material
US2862846A (en) * 1953-11-23 1958-12-02 Johnson & Johnson Method of making plastic strip adhesive bandages

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US985140A (en) * 1909-06-25 1911-02-28 Hedley Button Roof or wall covering.
US2057167A (en) * 1933-01-11 1936-10-13 Brown Co Manufacture of impregnated sheet products
US2194958A (en) * 1939-12-08 1940-03-26 American Anode Inc Aqueous dispersion of polymerized hydrocarbon material and method of preparing the same
US2301215A (en) * 1939-12-18 1942-11-10 Abbott Coburn Waterproofed material
US2254394A (en) * 1940-09-16 1941-09-02 Nat Automotive Fibres Inc Cutoff applying means
US2326723A (en) * 1940-12-18 1943-08-10 Carey Philip Mfg Co Roofing
US2454283A (en) * 1943-12-31 1948-11-23 Armstrong Cork Co Sealing element, including a binder consisting of polyisobutylene and factice
US2495636A (en) * 1944-05-22 1950-01-24 Cons Vultee Aircraft Corp Insulating pad
GB617067A (en) * 1945-08-08 1949-02-01 Cons Vultee Aircraft Corp Flexible insulating pads
US2587685A (en) * 1947-02-07 1952-03-04 Bergstein Robert Morris Method for the manufacture of articulated panels
US2700630A (en) * 1952-09-18 1955-01-25 Firestone Tire & Rubber Co Vinyl leather products and process of producing same
US2802764A (en) * 1952-10-08 1957-08-13 Owens Corning Fiberglass Corp Acoustical material
US2862846A (en) * 1953-11-23 1958-12-02 Johnson & Johnson Method of making plastic strip adhesive bandages

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257258A (en) * 1961-11-24 1966-06-21 D Andrea Angelo Ralph Apparatus for manufacturing frangible closures for containers
US3279594A (en) * 1965-02-04 1966-10-18 Iii George Y Worthington Protective envelope for flat articles and package containing said articles
US3772112A (en) * 1971-03-24 1973-11-13 Textile Cutting Corp Web cutting process
US20040172901A1 (en) * 2002-03-04 2004-09-09 Deming Joseph A. Insulated weather-resistant interlocking roof system and method

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Publication number Publication date
DE1120635B (de) 1961-12-28
BE588078A (en))
GB899390A (en) 1962-06-20

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