Patents by Inventor Leonard L. Diaddario, Jr.

Leonard L. Diaddario, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of forming a multilayer, corrosion-resistant finish
    Publication number: 20090032145
    Abstract: ABSTRACT OF THE DISCLOSURE The present invention is directed to a high protection coating process that is particularly useful for substrates in need of corrosion protection. The invention provides methods of applying a non-chrome passivating layer or conversion coating to a substrate and optionally, a secondary conversion or passivating layer to the non-chrome passivating layer or conversion coating, and articles having said coatings thereon.
    Type: Application
    Filed: June 23, 2008
    Publication date: February 5, 2009
    Applicant: Pavco, Inc.
    Inventors: Leonard L. Diaddario, JR., Michael Marzano, Steven K. Brennan, Michael Shone
  • Use of N-alllyl substituted amines and their salts as brightening agents in nickel plating baths
    Patent number: 7300563
    Abstract: An aqueous acidic plating bath for the electrodeposition of a nickel or nickel alloy deposit. The bath includes nickel ions and an additive having the general formula: H2C?CHCH2NR1R2 or [H2C?CHCH2N+R1R2R3]nXn? wherein R1, R2 and R3 are selected from the functional groups consisting of hydrogen, methyl, ethyl, propyl, allyl, propyn, propanediol and combinations thereof; and Xn? is an n-valent inorganic or organic anion.
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: November 27, 2007
    Assignee: Pavco, Inc.
    Inventor: Leonard L. Diaddario, Jr.
  • Trivalent chromate conversion coating
    Patent number: 7029541
    Abstract: In a preferred embodiment of the present invention, a conversion coating composition comprising chromium (III) ions, cobalt (II) ions, and nitric acid is provided. The coating composition is substantially free of chromium (VI) ions and substantially free of an oxidizing agent. The present trivalent chromium based conversion coating provides corrosion protection equal to or greater than most hexavalent chromium conversion coatings.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: April 18, 2006
    Assignee: Pavco, Inc.
    Inventors: Leonard L. Diaddario, Jr., Michael Marzano
  • Method for improving the macro throwing power for chloride zinc electroplating baths
    Patent number: 6143160
    Abstract: An aqueous acid plating bath for the electro-deposition of a zinc or zinc alloy deposit on a substrate which includes zinc ions and an additive of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the following functional groups hydroxyl, carbonyl, carboxylic acid or its salt; R.sub.3 is selected from the following groups hydrogen, hydroxyl, carbonyl, carboxylic acid or its salts; R.sub.4 and R.sub.5 are electron withdrawing groups, such as but not totally inclusive, halides, sulfonic acid or its salts, triflouromethyl, cyano, and amino groups.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: November 7, 2000
    Assignee: Pavco, Inc.
    Inventor: Leonard L. Diaddario, Jr.
  • Quaternary compounds as brightness enhancers
    Patent number: 5458737
    Abstract: A process is disclosed for maximizing the brightness of wood pulps which have been treated with anionic bleaching agents wherein the brightness is enhanced by the use of selected quaternary ammonium compounds.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: October 17, 1995
    Assignee: Hoechst Celanese Corporation
    Inventor: Leonard L. Diaddario, Jr.
  • Electrosynthesis of sodium dithionite
    Patent number: 4976835
    Abstract: An aqueous sulfuric acid anolyte solution is circulated through the anode compartment of an electrolytic cell, and an aqueous NaHSO.sub.3 catholyte solution is circulated through its cathode compartment, while maintaining an anolyte and catholyte temperature range of 20.degree.-25.degree. C., a catholyte pH range of 4.6 to 5.8, and a reduction potential of -1.25 to -1.50 V versus Ag.degree./AgCl, to produce an aqueous solution of Na.sub.2 S.sub.2 O.sub.4. Optimum pH is maintained by small additions of an alkali to the catholyte solution for electrolysis and solution stability.
    Type: Grant
    Filed: September 12, 1989
    Date of Patent: December 11, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Leonard L. Diaddario, Jr., Mark A. Schroeder