Abstract: Magnetic garnet compositions grown from a novel flux comprising a mixture of Li.sub.2 MoO.sub.4 and R.sub.2 (MoO.sub.4).sub.3 wherein R represents yttrium or a rare earth element having an atomic number from 62 to 71 have appropriate magnetic properties for use in bubble domain devices. Items produced are uniform in composition and may be of submicron thickness.
Type:
Grant
Filed:
December 30, 1977
Date of Patent:
May 5, 1981
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
William A. Bonner, LeGrand G. Van Uitert
Abstract: A technique is described for the preparation of novel conjugatively linked tetrathiafulvalenes. The resultant molecule includes two donor moieties which allow the preparation of charge transfer complexes with a band structure higher than the quasi one dimensional structure indigenous to presently known electrically conducting organic complexes.
Type:
Grant
Filed:
January 26, 1979
Date of Patent:
February 3, 1981
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Robert C. Haddon, Martin L. Kaplan, Fred Wudl
Abstract: A novel procedure for circulating blowing air through an injection blow molded article during the blow cooling cycle of an injection molding process is described. The technique involves the use of a new core rod assembly which permits internal circulation of cool air during the blow cooling cycle of the process.
Abstract: A technique is described for bonding flexible printed circuitry to a rigid base plane by means of a tacky contact adhesive which is subsequently cured by heating into a nontacky condition. The procedure involves pressing the adhesive on the surface of a rigid support member to which it adheres and subsequently applying a flexible sheet thereto and laminating under moderate pressure. The adhesive is then removed from through holes with a solvent and the resultant assembly subjected to heating to cure the adhesive. It has been found that the use of this procedure permits removal of the solvent without detrimental solvent retention and also avoids the collecting of debris at the edge of the adhesive layer during subsequent processing and use.
Type:
Grant
Filed:
December 27, 1976
Date of Patent:
October 7, 1980
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique is described for the preparation of an electrically conductive adhesive system and electrical devices including such system. Briefly, the adhesive system comprises a novolac epoxy resin and a chemically blocked imidazole curing agent in combination with a viscosity reducer and conductive particles. The resulting adhesive system is found comparable to commercially available adhesive systems and is superior thereto with respect to thermal stability.
Type:
Grant
Filed:
August 4, 1978
Date of Patent:
July 1, 1980
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A novolak resin suitable for use as a light-sensitive photoresist or maskant is prepared by reaction of at least one cresol with an aldehyde or reactive ketone and an aromatic hydroxyl compound having an alkyl side chain of from 3-15 carbon atoms. The addition of a conventional photosensitive agent yields a composition evidencing superior characteristics as compared with prior art novolak photoresists and which requires less sensitizer than such prior art resists.
Type:
Grant
Filed:
November 9, 1977
Date of Patent:
November 6, 1979
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Susan Fahrenholtz, David T. Long, Raymond C. Pitetti
Abstract: A novel procedure for circulating blowing air through an injection blow molded article during the blow cooling cycle of an injection molding process is described. The technique involves the use of a new core rod assembly which permits internal circulation of cool air during the blow cooling cycle of the process. The described assembly may also be used for reconditioning itself by the use of heated air, so avoiding the phenomenon of core rod freeze-up.
Abstract: A water-based polymeric coating comprising a novolak resin is deposited electrolytically from a solution of a novolak resin upon a conductive substrate at an initial current density ranging from 10-30 milliamperes per square centimeter. The resultant coating, after cross linking by subsequent chemical treatment, is flexible, firmly adherent and evidences good thermal stability and insulation characteristics, so suggesting its use as a cover coat for printed circuits.
Type:
Grant
Filed:
March 9, 1977
Date of Patent:
January 2, 1979
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A method for retarding corrosion of metal surfaces involves rinsing the surface to be coated in an aqueous solution of benzotriazole and dip-coating the structure in a solution of a methacrylate homopolymer or copolymer. The coated surface is than heated to yield an adherent polymer on the metal surface.
Type:
Grant
Filed:
November 1, 1976
Date of Patent:
October 31, 1978
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique is disclosed for the preparation of stable vinyl chloride polymers. The technique involves reacting a vinyl chloride polymer in solution with an organic thiol compound, precipitating the polymer from solution and subjecting it to solvent extraction.
Type:
Grant
Filed:
September 8, 1976
Date of Patent:
July 4, 1978
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique for internally cooling a blow molded article with a coolant comprising a mixture of subzero temperature dry air and water. A pressure swing dessicant bed type dryer and chiller are used to supply the dry air having a dew point of the order of -60.degree. F and a temperature ranging from -30.degree. to -50.degree. F for introduction into the blow molded article.
Abstract: Alloy compositions based on ternary alloys of the chromium-cobalt-iron system modified by addition of zirconium molybdenum, niobium, vanadium, titanium, and/or aluminum, are found to manifest improved formability. Exemplary compositions are magnetic and evidence coercivities of 350-550 Oe., remanent magnetizations of from 10,000 - 7,500 Gauss, and maximum energy products in excess of one million. Improvement in formability may take the form of room temperature stamping, sometimes in air, to final configurations including curvatures of radius equal to thickness. Novel compositions particularly desirable from such standpoint necessarily contain zirconium together with aluminum, niobium, and/or titanium.
Type:
Grant
Filed:
July 16, 1976
Date of Patent:
February 21, 1978
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Gilbert Yukyu Chin, John Travis Plewes, Bud Caesar Wonsiewicz
Abstract: A novel procedure for circulating blowing air through an injection blow molded article during the blow cooling cycle of an injection molding process is described. The technique involves the use of a new core rod assembly which permits internal circulation of cool air during the blow cooling cycle of the process. The described assembly may also be used for reconditioning itself by the use of heated air, so avoiding the phenomenon of core rod freeze-up.
Abstract: A flexible photopolymerizable resin is prepared in a two-stage process by the esterification of castor oil which chlorendic anhydride to yield a chlorendic anhydride half ester and the subsequent reaction of the half ester with a reagent having acrylic functionality, a cure retardant and an acrylic functional monomer. The resultant acrylic ester evidences superior insulation resistance during aging.
Type:
Grant
Filed:
February 23, 1976
Date of Patent:
December 27, 1977
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique is described for stabilizing gold plated electrical contacts wherein the contacts are treated with an oxidizing agent at elevated temperatures, so resulting in a contact structure which does not evidence resistance drift during subsequent thermal aging. Additionally, the technique may be used to reduce the contact resistance of thermally aged contacts which were not subjected to the foregoing preparative process.
Type:
Grant
Filed:
July 26, 1976
Date of Patent:
September 20, 1977
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique is described for depositing organic layers down to a fraction of a monolayer thickness upon insulating substrates by non-vacuum deposition techniques which permit the subsequent deposition of mechanically stable adherent films of b.c.c. tantalum of low resistivity. The deposited films permit the fabrication of low cost, high frequency performance tantalum thin film capacitors.
Type:
Grant
Filed:
May 13, 1976
Date of Patent:
July 19, 1977
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique for the fabrication of hybrid integrated circuitry combining the expedients of thick and thin film technology is described. A novel processing sequence for attaining ohmic contact between thick film resistors and thin film conductive metallization involves the use of an interphase gold tab as a conductive link.
Type:
Grant
Filed:
May 9, 1975
Date of Patent:
June 21, 1977
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique is disclosed for the preparation of stable vinyl chloride polymers which are substantially free of heavy metal residues. The technique involves reacting a vinyl chloride polymer in solution with an organotin compound, precipitating the polymer from solution and subjecting it to solvent extraction.
Type:
Grant
Filed:
March 24, 1976
Date of Patent:
June 7, 1977
Assignee:
Bell Telephone Laboratories, Incorporated
Abstract: A technique for preparing stoichiometric group III-V compound semiconductor surfaces involves a repetitive anodizing and etching sequence in an aqueous solution of appropriate pH and a basic solution, respectively. Surfaces treated in the described manner evidence a correct surface stoichiometry and minimum carbon contamination.
Type:
Grant
Filed:
June 16, 1976
Date of Patent:
May 31, 1977
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Chuan Chung Chang, Paul H. Citrin, Bertram Schwartz
Abstract: Electrical device having a metal surface to at least a portion of which electrical connections are to be made by soldering, and having a coating on said portion which protects it against surface alteration which would tend to render such soldering more difficult but through which coating soldering can be effected, said coating comprising a polymer of at least one methacrylate of the general formula ##STR1## wherein R is selected from the group comprising alkyl radicals having from 1-6 carbon atoms and a glycidyl radical.
Type:
Grant
Filed:
June 9, 1975
Date of Patent:
December 21, 1976
Assignee:
Bell Telephone Laboratories, Incorporated
Inventors:
Edwin Arthur Chandross, Coralie Anne Pryde