Patents by Inventor Sanford M. Marcus

Sanford M. Marcus 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 and apparatus for thermal conductivity measurements
    Patent number: 5335993
    Abstract: A method and apparatus for measuring the thermal conductivity of materials using modulated differential scanning calorimetry (MDSC). Two MDSC heat capacity measurements are made consecutively. One measurement is made under conditions which ensure obtaining a fairly accurate value for the heat capacity of the material ("quasi-ideal conditions"). Another measurement is made under conditions such that the measured effective heat capacity differs from the accurate value of the heat capacity due to thermal conductivity effects. Generally, the non-ideal conditions differ from the ideal conditions by one parameter, such as the size of the sample, the modulation frequency used to measure the heat capacity, or, for thin films, the presence or absence of a specimen on the thin film. The thermal conductivity of the material is then calculated from the difference between the heat capacity measured under quasi-ideal conditions and the effective heat capacity measured under non-ideal conditions.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: August 9, 1994
    Assignee: TA Instruments, Inc.
    Inventors: Sanford M. Marcus, Michael Reading
  • Bipolar liquid electrostatic developer
    Patent number: 4985329
    Abstract: Bipolar liquid electrostatic developer consisting essentially of at least one charge director in a nonpolar liquid having dispersed therein two toner particles having opposite charge polarity which comprise at least one thermoplastic copolymer resin. The particle average by area size is less than 10 .mu.m. The ratio of the two toner particles is 5 to 95 and 95 to 5. A process of simultaneous transfer of such developer is included. The developer is useful in copying.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Lyla M. El-Sayed, Sanford M. Marcus, Torence J. Trout
  • Silicon solar cells with aluminum-magnesium alloy low resistance contacts
    Patent number: 4375007
    Abstract: An Al-Mg alloy is mixed with a Ni-Sb alloy or Al, in powder form, to form a thick-film metallizing paste useful for making low resistance electrically conductive contacts to a silicon solar cell coated with Si.sub.3 N.sub.4.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: February 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Sanford M. Marcus
  • Silicon solar cell N-region metallizations comprising a nickel-antimony alloy
    Patent number: 4361718
    Abstract: The n-type region of a silicon solar cell is metallized with a nickel-antimony alloy to provide an external contact.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: November 30, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Sanford M. Marcus, Joseph R. Rellick
  • Aluminum-magnesium alloys in low resistance contacts to silicon
    Patent number: 4347262
    Abstract: An Al-Mg alloy is mixed with a Ni-Sb alloy or Al, in powder form, to form a thick-film metallizing paste useful for making low resistance electrically conductive contacts to a silicon solar cell coated with Si.sub.3 N.sub.4.
    Type: Grant
    Filed: November 26, 1980
    Date of Patent: August 31, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Sanford M. Marcus
  • Solar cell metallizations comprising a nickel-antimony alloy
    Patent number: 4342795
    Abstract: A silicon solar cell is metallized with a nickel-antimony alloy to provide external contacts.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: August 3, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Sanford M. Marcus, Joseph R. Rellick
  • Temperature coefficient of resistance modifiers for thick film resistors
    Patent number: 4225468
    Abstract: Temperature coefficient of resistance (TCR) modifiers, useful in thick film resistor compositions, which can be fired in nonoxidizing atmosphere and which are based on LaB.sub.6 and glass powders dispersed in a vehicle, are provided. Among such TCR modifiers are included TiO, Ge, Si, and graphite.
    Type: Grant
    Filed: August 16, 1978
    Date of Patent: September 30, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul C. Donohue, Sanford M. Marcus