Lucian Borduz from 41 Bell Cove Rd, Northwood, NH 03261, Phone: 6039421267

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Location:

111 Herrick St, Merrimack, NH 03054

Work:

Amro Environmental Laboratories Corporation
Vice President and Owner

Education:

Polytechnic Institut "Traian Vuia " Timisoara, Romania 1965 - 1970
Masters

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Location:

Northwood, NH

Work:

Amro Environmental Laboratories Corp
Vice President

Ferrofluid Composition And Process
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US Patent:

62772988, Aug 21, 2001
Filed:

Oct 28, 1999
Appl. No.:

9/429189
Inventors:

Lucian Borduz - Northwood NH
Shiro Tsuda - Asahi-shi, Chiba 289-2515, JP
Yasutake Hirota - #13, Manchester NH
International Classification:

H01F 128
US Classification:

252 6252
Abstract:

The invention relates to a composition and process for producing a chemically stable magnetic fluid comprising a plurality of magnetic particles covered first with a small molecular weight surface modifier, which is a nondispersant and acts as a surfactant-accepting layer, and then with at least one surfactant. The surface modifier/surfactant coated magnetic particles are then suspended in a silicone oil-based, hydrocarbon oil-based or an ester oil-based carrier liquid.

Electrically Conductive Ferrofluid Bearing And Seal Apparatus And Low-Viscosity Electrically Conductive Ferrofluid Used Therein
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US Patent:

46739971, Jun 16, 1987
Filed:

Sep 9, 1985
Appl. No.:

6/773627
Inventors:

Hanumaiah L. Gowda - Nashua NH
Kuldip Raj - Merrimack NH
Lucian Borduz - Nashua NH
Assignee:

Ferrofluidics Corporation - Nashua NH
International Classification:

G11B 552
G11B 2104
E21B 3300
G01M 2782
US Classification:

360107
Abstract:

An electrically conductive ferrofluid-film-bearing apparatus and seal apparatus for a shaft which employs a low-viscosity, electrically conductive ferrofluid composition, which composition comprises a liquid carrier, and contains in combination an electrically conductive amount of a cationic surfactant and dispersed carbon particles, to obtain a low-electrical-resistivity ferrofluid having a low viscosity and suitable for use in a ferrofluid bearing apparatus.

Low Viscosity, Electrically Conductive Ferrofluid Composition And Method Of Making And Using Same
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US Patent:

46875964, Aug 18, 1987
Filed:

Jun 19, 1986
Appl. No.:

6/875985
Inventors:

Lucian Borduz - Milford NH
Kuldip Raj - Merrimack NH
Assignee:

Ferrofluidics Corporation - Nashua NH
International Classification:

H01B 106
US Classification:

252510
Abstract:

A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises: a first polar liquid carrier; a second polar liquid carrier miscible in the first polar carrier and comprising a polyol, such as a tetraethylene glycol dimethyl ether; magnetic particles to impart magnetic characteristics to the ferrofluid composition; and a surfactant, particularly a cationic surfactant in an amount sufficient to stabilize and disperse the magnetic particles, the surfactant dissociated or ionized predominately by the second polar liquid carrier.

Method Of Preparing Low Viscosity, Electrically Conductive Ferrofluid Composition
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US Patent:

47327065, Mar 22, 1988
Filed:

May 26, 1987
Appl. No.:

7/054412
Inventors:

Lucian Borduz - Nashua NH
Kuldip Raj - Merrimack NH
Assignee:

Ferrofluidics Corporation - Nashua NH
International Classification:

H01B 106
US Classification:

252510
Abstract:

A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises: a first polar liquid carrier; a second polar liquid carrier miscible in the first polar carrier and comprising a polyol, such as a tetraethylene glycol dimethyl ether; magnetic particles to impart magnetic characteristics to the ferrofluid composition; and a surfactant, particularly a cationic surfactant in an amount sufficient to stabilize and disperse the magnetic particles, the surfactant dissociated or ionized predominately by the second polar liquid carrier.

Process For Producing A Magnetic Fluid And Composition Therefor
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US Patent:

60568895, May 2, 2000
Filed:

Oct 10, 1997
Appl. No.:

8/948951
Inventors:

Shiro Tsuda - Chiba, JP
Kacey Wiley Heckman - Newton NH
Yasutake Hirota - Hyogokeu, JP
Stefan Borduz - Milford NH
Lucian Borduz - Northwood NH
Assignee:

Ferrotec Corporation - Tokyo
International Classification:

H01F 144
US Classification:

252 6252
Abstract:

The invention relates to a composition and a process for producing a chemically stable magnetic fluid comprising finely divided magnetic particles covered with surfactants. A surface modifier is also employed which is added to cover thoroughly the free oxidizable exterior surface of the outer layer of the particles to assure better chemical stability of the colloid under different environmental conditions.

Process For Producing A Magnetic Fluid And Composition Therefor
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US Patent:

56768770, Oct 14, 1997
Filed:

Mar 26, 1996
Appl. No.:

8/622315
Inventors:

Stefan Borduz - Milford NH
Lucian Borduz - Northwood NH
Shiro Tsuda - Chiba, JP
Assignee:

Ferrotec Corporation - Tokyo
International Classification:

H01F 128
US Classification:

252 6252
Abstract:

The invention relates to a composition and a process for producing a chemically stable magnetic fluid comprising finely divided magnetic particles covered with surfactants. A surface modifier is also employed which is added to cover thoroughly the free oxidizable exterior surface of the outer layer of the particles to assure better chemical stability of the colloid under different environmental conditions.

Electrically Conductive Ferrofluid Compositions And Method Of Preparing And Using Same
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US Patent:

46042296, Aug 5, 1986
Filed:

Mar 20, 1985
Appl. No.:

6/713757
Inventors:

Kuldip Raj - Merrimack NH
Lucian Borduz - Nashua NH
Hanumaiah L. Gowda - Nashua NH
Assignee:

Ferrofluidics Corporation - Nashua NH
International Classification:

H01B 106
US Classification:

252510
Abstract:

An electrically conductive ferrofluid composition and a method of preparing and using the ferrofluid composition in a ferrofluid seal apparatus, and which ferrofluid composition comprises a liquid carrier having a colloidal dispersion of ferromagnetic particles in an amount sufficient to provide magnetic properties to the ferrofluid composition and carbon particles in an amount sufficient to provide electrical conductive properties to the ferrofluid composition, the ferromagnetic and carbon particles stabilized in the ferrofluid composition by a surface active dispersing agent. The electrically conductive ferrofluid composition is usefully employed in a ferrofluid exclusion seal apparatus to provide an electrically conductive seal apparatus particularly useful for computer disk drives and sputtering apparatus in the semiconductive industry.

Stable Ferrofluid Composition And Method Of Making And Using Same
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US Patent:

46042229, Aug 5, 1986
Filed:

May 21, 1985
Appl. No.:

6/736388
Inventors:

Lucian Borduz - Nashua NH
Kuldip Raj - Merrimack NH
Assignee:

Ferrofluidics Corporation - Nashua NH
International Classification:

H01F 125
US Classification:

252 6252
Abstract:

A stable ferrofluid composition and the method of preparing and using the ferrofluid composition, such as in a ferrofluid seal apparatus, and which ferrofluid composition comprises: a liquid carrier; ferromagnetic particles sufficient to provide magnetic properties to the ferrofluid dispersed in the liquid carrier; and a dispersing amount of a cationic surfactant to provide a stable ferrofluid composition. The stable ferrofluid compositions have improved electrical conductivity and are useful in sealing computer disc drives and in sputtering apparatus in the semiconductive industry.