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US5478650A Expired / Lapsed US ⏱️ 0.0 years remaining

Nanophase diamond films

Assignee: The University of Texas System
•
Filing: 1995-05-02
•
Granted: 1995-12-26
•
Expires: 2015-05-02
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Abstract

Abstract Films of nanometer-scale nodules of diamond-bonded carbon structures are disclosed. Such films may be used, for example, to coat objects to improve their resistance to wear. Moreover, because the nanophase diamond films of the present invention are of optical quality, they may be used to coat optical lenses and the like. The nanophase diamond films of the present invention have diamond-like properties, indicating a preponderance of sp 3 bonds within the nodules and a substantial absence of hydrogen and graphite within the nodules. If desired, the nanophase diamond films disclosed herein may be created to have a hardness exceeding that of natural diamond, depending on the quantity of graphite left in the voids between the nodules. The nanophase diamond films of the present invention are also characterized by a low coefficient of friction, by low average internal stress, and by an optical quality capable of providing a visual appearance of Newton's rings of interference.

Inventors

  • 👤 Farzin Davanloo
  • 👤 Carl B. Collins

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 00:56
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28; C23C14/06; C23C14/0605; C30; C30B; C30B23/00; C30B23/02; C30B29/00; C30B29/02; C30B29/04; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30; Y10T428/31504; Y10T428/31678

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 62 words
A nanophase diamond film, comprising nodules of carbon bonded predominantly in three dimensional sp 3 bonds, said film comprising less than about 20% hydrogen, having an imaginary index of refraction less than 0.5 for a light wavelength of about 632.8 nm, and said nodules having a diameter of less than about 500 angstroms, wherein said film is chemically bonded with a substrate.
Claim 2
Dependent Claim 62 words
A nanophase diamond film, comprising nodules of carbon bonded predominantly in three dimensional sp 3 bonds, said film comprising less than about 20% hydrogen, having an imaginary index of refraction less than 0.5 for a light wavelength of about 632.8 nm, and said nodules having a diameter of less than about 500 angstroms, wherein said film is chemically bonded with a substrate.
Claim 3
Dependent Claim 19 words
The nanophase diamond film of claim 1, wherein said film is bonded to a substrate with an alloyed layer.
Claim 4
Dependent Claim 22 words
The nanophase diamond film of claim 2, wherein said alloyed layer has a thickness between about 5 nm to about 50 nm.
Claim 5
Dependent Claim 59 words
A nanophase diamond film forming a layer upon a surface of a substrate, comprising nodules of carbon bonded predominantly in three dimensional sp 3 bonds, said film comprising less than about 20% hydrogen, having an imaginary index of refraction less than 0.5 for a light wavelength of about 632.8 nm, and said nodules having a diameter of less than.
Claim 6
Dependent Claim 59 words
A nanophase diamond film forming a layer upon a surface of a substrate, comprising nodules of carbon bonded predominantly in three dimensional sp 3 bonds, said film comprising less than about 20% hydrogen, having an imaginary index of refraction less than 0.5 for a light wavelength of about 632.8 nm, and said nodules having a diameter of less than.

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-12-25 1999-06-26 1999-12-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-12-25 2003-06-26 2003-12-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-12-25 2007-06-26 2007-12-26 $7700.00 Window Closed / Lapsed

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