Abstract: Biomedical devices with stable, hydrophilic and antimicrobial coatings are provided. The coatings are formed using a coupling agent to bond a carboxyl containing hydrophilic coating to the surface by ester or amide linkages.
Type:
Grant
Filed:
June 11, 1998
Date of Patent:
July 11, 2000
Assignee:
Johnson & Johnson Vision Care, Inc.
Inventors:
Douglas G. Vanderlaan, David C. Turner, Joe M. Wood
Abstract: The invention provides progressive addition lenses in which lens unwanted astigmatism is reduced and channel width through the intermediate and near vision zones is increased as compared to conventional progressive addition lenses. This result is achieved by combining a progressive addition surface with a first dioptric add power with at least one optical element that provides additional dioptric add power to the lens.
Type:
Grant
Filed:
September 3, 1998
Date of Patent:
July 11, 2000
Assignee:
Johnson & Johnson Vision Care, Inc.
Inventors:
Ronald D. Blum, Russell A. Chipman, Amitava Gupta, Edgar Vithal Menezes
Abstract: The invention provides marks for use in contact lenses and contact lenses that contain the marks, which marks are highly visible. The marks of the invention are useful for determining the inside versus the outside of the lens as well as for diagnostic purposes.
Abstract: The invention provides hydrogels for use in the production of biomedical devices. In particular, the invention provides hydrogels formed from siloxane prepolymers and a hydrophilic monomer, which hydrogels are optically transparent.
Type:
Grant
Filed:
September 30, 1998
Date of Patent:
February 29, 2000
Assignee:
Johnson & Johnson Vision Products, Inc.
Inventors:
Douglas G. Vanderlaan, Frank Molock, Giancarlo Fruzzetti
Abstract: The present invention relates to a process for the reduction dechlorination of ClCF.sub.2 CFClCF.sub.2 Cl to HCF.sub.2 CHFCF.sub.2 H comprising the step of contacting 1,2,3-trichloropentafluoroethane and H.sub.2 over a catalyst selected from the group consisting of palladium, platinum, ruthinium, rhodium, iridium and mixtures thereof under reaction conditions sufficent to produce a product stream containing 1,1,2,3,3-pentafluoropropane. The present invention further relates to a three step process wherein the ClCF.sub.2 CFClCF.sub.2 Cl to be reduced is synthesized by:(a) reacting HF with a compound of formula I: XCH.dbd.CYCH.sub.2 X, where X is H, Cl, or F, Y is H or Cl;to give a compound of formula II: CH.sub.2 XCFYCH.sub.2 X, where X and Y are the same as in the compound of formula I:(b) chlorinating the compound of formula II to give a compound of formula III: CCl.sub.3-m F.sub.m CFClCCl.sub.3-m F.sub.m where m is zero or 1, and(c) fluorinating the compound of formula III to give CClF.sub.2 CFClCF.sub.
Abstract: The present invention provides a method for separating dichlorodifluoromethane from difluoromethane. More specifically, a process is provided for separating dichlorodifluoromethane and difluoromethane using azeotropic distillation.
Type:
Grant
Filed:
May 23, 1996
Date of Patent:
July 28, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Gustavo Cerri, Kin Ching Kong, Charles Francis Swain, Rajat Subhra Basu
Abstract: An improved ion exchange process for purifying and/or concentrating hydroxylamine from an aqueous solution comprising hydroxylammonium ion and counter anions wherein ion exchange process conditions including effluent pH, effluent conductivity, and ion exchange bed height can be monitored and used to identify when to switch from an ion exchange step feed to a water wash feed, and to switch from a desorbent step to a water rinse step.
Type:
Grant
Filed:
May 3, 1996
Date of Patent:
June 9, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Chin-Hsiung Chang, Albert S. Stella, Miguel A. Gualdron, Wende M. Fisher, Mike Poole
Abstract: The present invention provides a vapor phase process for the production of difluoromethane, HFC-32. The process of this invention provides for the preparation of HFC-32 by a process that exhibits both good product yield and selectivity.
Type:
Grant
Filed:
September 20, 1995
Date of Patent:
June 9, 1998
Assignee:
Allied Signal Inc.
Inventors:
Paul Gene Clemmer, Addison Miles Smith, Hsueh Sung Tung, John Stephen Bass
Abstract: The present invention provides refrigerant blends which are replacements for chlorodifluoromethane(HCFC-22). The present blends have refrigeration characteristics which are similar to HCFC-22. The blends comprise from about 10 to about 90 weight percent of a first component selected from the group consisting of 1,1,1-trifluoroethane, difluoromethane, propane, and mixtures thereof; from about 1 to about 50 weight percent of a second component selected from the group consisting of hydrofluorocarbon having 1 to 3 carbon atoms, fluorocarbon having 1 to 3 carbon atoms, inorganic compound, and mixtures thereof having a boiling point at atmospheric pressure in the range from about -90 degrees C. to less than -50 degrees C.; and from about 1 to about 50 weight percent of a third component which is hydrofluorocarbon having 1 to 3 carbon atoms, other than 1,1,1-trifluoroethane, having a boiling point at atmospheric pressure in the range from about -50 degrees C. to about -10 degrees C.
Type:
Grant
Filed:
October 24, 1996
Date of Patent:
April 7, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Robert Gerard Richard, Ian R. Shankland, Rajiv Ratna Singh
Abstract: Azeotrope-like compositions of trifluoromethane, carbon dioxide, ethane, and hexafluoroethane are provided. The compositions of the invention are environmentally desirable for use as refrigerants, aerosol propellants, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.
Type:
Grant
Filed:
May 1, 1996
Date of Patent:
March 17, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Rajiv Ratna Singh, Ian Robert Shankland, Roy Phillip Robinson, Hang Thanh Pham, Raymond Hilton Percival Thomas, Peter Brian Logsdon
Abstract: A process for producing benzophenone compounds is provided. Specifically, a process is provided for producing benzophenone compounds in which a diphenylmethane compound is reacted with manganese dioxide and a strong acid. The process yields the product benzophenone in high purity and good yield.
Type:
Grant
Filed:
July 1, 1996
Date of Patent:
March 3, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Lee Alan DeWitt, Heng Su, Chempolil Thomas Mathew
Abstract: The present invention relates to a process for recovering sulfur hexafluoride ("SF.sub.6 "). More specifically, the invention provides a pressure swing adsorption--desorption process for recovering SF.sub.6 from a gas stream using zeolites, activated carbons, or silicalites to adsorb the SF.sub.6.
Type:
Grant
Filed:
December 18, 1996
Date of Patent:
February 24, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Stephen Frederic Yates, Romulus Gaita, Amar Ramachandra, Robert Morrell
Abstract: A method for the preparation of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and 1-chloro-3,3,3-trifluoropropene (HCFC-1233). 1,1,1,3,3-pentachloropropane (HCC-240fa) is fluorinated with HF in a vapor phase in the presence of a vapor phase catalyst. The HCFC-1233 and any co-produced 1,3,3,3-tetrafluoropropene (HFC-1234) are recycled for further fluorination by HF for a greater than 99% HCC-240fa conversion.
Abstract: A process for minimizing the compositional changes that occur in a non-azeotropic composition during the withdrawal of an amount of the composition from a storage vessel. The process of the invention provides for the minimization of compositional changes by cooling the non-azeotropic composition.
Abstract: Fluorination processes using hydrogen fluoride-containing fluorinating agents that are safely and easily handled, transported, and stored and that also exhibit good reactivity are provided. More particularly, the invention provides processes for producing fluorinated products using fluorinating agents comprising hydrogen fluoride and a carrier that may be an acid salt or a water-soluble polymer.
Type:
Grant
Filed:
March 7, 1996
Date of Patent:
January 6, 1998
Assignee:
AlliedSignal Inc.
Inventors:
Michael Van Der Puy, Jeffrey Warren Mckown, Hang Thanh Pham, Andrew Joseph Poss, Rajiv Ratna Singh
Abstract: A protective bottle jacket for transporting a container, bottle or the like is provided. The protective jacket has a bottom portion having a base and walls projecting upwardly from the base for receiving and protecting the bottom portion of the container and a top portion having walls for covering the top portion of the container. The protective jacket has means for selectively and releasably interlocking the bottom and top portions together. The interlocking means comprises a male member disposed on one of the bottom and top portions and a passage disposed on the other of the bottom and top portions for slidably receiving the male member between an unlocked and locked position in response to rotation of the top and bottom jacket portions, wherein the passage lockably receives the male member and attaches the top and bottom portions together in the locked position and wherein the male member does not lockably engage the passage in the unlocked position.
Type:
Grant
Filed:
July 18, 1996
Date of Patent:
January 6, 1998
Assignee:
Allied Signal Inc.
Inventors:
Thomas L. Spinks, Russell L. Bromley, James T. Przybytek
Abstract: The present invention provides hydrochlorofluorocarbons having 3 to 5 carbons atoms, 1 to 2 chlorine atoms, and an OH rate constant from about 8 to about 25 cm.sup.3 /molecule/sec.times.10.sup.-14. The hydrochlorofluorocarbons are useful as solvents and blowing agents.
Abstract: Hydrofluoroalkanes useful as solvents, especially for vapor degreasing and solvent cleaning, are one or many of the following formulae:CHF.sub.2 --X--(CHF).sub.n --X--Ywherein X is selected from the group consisting of CHF, CF.sub.2 and CH.sub.2, Y is CH.sub.3, and n is 0, 1 or 2.
Type:
Grant
Filed:
January 21, 1994
Date of Patent:
December 9, 1997
Assignee:
AlliedSignal Inc.
Inventors:
Michael Van Der Puy, Rajat Subhra Basu, David Nalewajek, Lois A. Ellis
Abstract: Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and 1,1-dichloro-1-fluoroethane are provided. The compositions of the invention are useful in the preparation of polyurethane and polyisocyanurate foams and as aerosol propellants.
Type:
Grant
Filed:
July 11, 1996
Date of Patent:
November 18, 1997
Assignee:
AlliedSignal Inc.
Inventors:
Earl August Eugene Lund, deceased, Robert Christian Parker, Ian Robert Shankland, Gary Michael Knopeck