US4834400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential surface roughness dynamic seals and bearings
Assignee: MECHANICAL SEAL TECHNOLOGY
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Filing: 1988-03-15
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Granted: 1989-05-30
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Expires: 2008-03-15
Abstract
Abstract A dynamic seal or bearing interface having areas with different roughnesses. The different surface areas both provide asperity tip load support for the opposing interface.
Inventors
- 👤 Alan O. Lebeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:30
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/26; F16J15/28; F16J15/34; F16J15/3404; F16J15/3408; F16J15/3424; F16C; F16C29/00; F16C29/02; F16C33/00; F16C33/02; F16C33/04; F16C33/043; F16J10/00; F16J10/02; F16J10/04; F16J15/3412; F16J9/00; F16J9/26; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0882; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49703; Y10T29/49707
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
78 words
A dynamic seal or bearing interface having a surface comprising: a first interface area which, as it wears, provides a first amount of surface roughness which provides asperity tip load support; and a second interface area which, as it wears, provides a second amount of surface roughness which provides asperity tip load support, said second amount of surface roughness within said second interface area being different from said first amount of surface roughness within said first interface area.
Claim 2
Dependent Claim
78 words
A dynamic seal or bearing interface having a surface comprising: a first interface area which, as it wears, provides a first amount of surface roughness which provides asperity tip load support; and a second interface area which, as it wears, provides a second amount of surface roughness which provides asperity tip load support, said second amount of surface roughness within said second interface area being different from said first amount of surface roughness within said first interface area.
Claim 3
Dependent Claim
16 words
The invention of claim 1 wherein said first and second interface areas are alternating and intersticed.
Claim 4
Dependent Claim
16 words
The invention of claim 1 wherein said first and second interface areas are alternating and contiguous.
Claim 5
Dependent Claim
35 words
The invention of claim 1 wherein said first interface area and second interface area comprise the same material and the microstructure of one of said interface areas is changed relative to the other interface area.
Claim 6
Dependent Claim
18 words
The invention of claim 1 wherein said first interface area and said second interface area comprise different materials.
Claim 7
Dependent Claim
12 words
The invention of claim 1 comprising a radial land-dam mechanical face seal.
Claim 8
Dependent Claim
11 words
The invention of claim 1 comprising a spiral-groove mechanical face seal.
Claim 9
Dependent Claim
17 words
The invention of claim 1 wherein said first and second interface areas are affixed to a substrate.
Claim 10
Dependent Claim
52 words
The invention of claim 1 wherein said dynamic seal or bearing interface surface comprises gray iron and the amount of surface roughness of at least one of said interface areas is produced by at least one of the processes selected from the group consisting of leaching, filling, chrome plating and flame spraying.
Claim 11
Dependent Claim
28 words
The invention of claim 1 wherein said substrate comprises cast iron, said first interface area comprises hard chrome plate and said second interface area comprises soft chrome plate.
Claim 12
Dependent Claim
37 words
The invention of claim 1 wherein said dynamic seal or bearing interface surface comprises carbidic malleable iron and the amount of surface roughness of at least one of said interface areas is produced by laser heat treating.
Claim 13
Dependent Claim
21 words
The invention of claim 1 wherein said first interface area comprises high-density alumina and said second interface area comprises low-density alumina.
Claim 14
Dependent Claim
23 words
The invention of claim 1 wherein said first interface area comprises high-density silicon nitride and said second interface area comprises low-density silicon nitride.
Claim 15
Dependent Claim
50 words
The invention of claim 1 wherein said dynamic seal or bearing interface comprises carbon graphite and the amount of surface roughness of at least one of said interface areas is produced by at least one of the processes selected from the group consisting of siliconizing, density variation, and variable filler.
Claim 16
Dependent Claim
48 words
The invention of claim 1 wherein the dynamic seal or bearing interface comprises a polymer and the amount of surface roughness of at least one of said interface areas is produced by at least one of the processes selected from the group consisting of variable filler and radiation.
Claim 17
Dependent Claim
28 words
The invention of claim 1 wherein at least one of said interface areas is treated by a roughness producing process to a depth of at least 0.005 inches.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |