US3975568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-friction, wear-resistant material and process for making the same
Assignee: Praxair ST Technology Inc
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Filing: 1974-10-30
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Granted: 1976-08-17
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Expires: 1994-10-30
Abstract
Abstract A composite material comprising substantially uniformly dispersed, tightly packed smooth spheres or spheroids embedded in a matrix with the size of the spheres or spheroids being between 10 and about 50 mesh USA Sieve size and the surface roughness of said spheres or spheroids being between 1 and about 70 microinches R.M.S.
Inventors
- 👤 Robert G. Rudness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63448; C04B35/63452; C23; C23C; C23C24/00; D; D21; D21F; D21F1/00; D21F1/48; D21F1/483; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/043; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/259
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A material for use in contacting moving Fourdrinier paper machine synthetic fabric forming wires comprising substantially uniformly dispersed spheroidal to spherical shaped wear resistant particles embedded in a plastic matrix and said particles forming a tightly packed monolayer which forms a wear surface, said plastic matrix being formed from a plastic taken from the class consisting of thermoplastic and thermosetting resins and said particles being selected from at least one of the group consisting of metal oxides, metal carbides, metal borides, metal silicides and metal nitrides with said particles being sized between about 10 and about 50 mesh USA sieve size with a surface roughness between 1 and about 70 microinches RMS.
Claim 2
Dependent Claim
112 words
A material for use in contacting moving Fourdrinier paper machine synthetic fabric forming wires comprising substantially uniformly dispersed spheroidal to spherical shaped wear resistant particles embedded in a plastic matrix and said particles forming a tightly packed monolayer which forms a wear surface, said plastic matrix being formed from a plastic taken from the class consisting of thermoplastic and thermosetting resins and said particles being selected from at least one of the group consisting of metal oxides, metal carbides, metal borides, metal silicides and metal nitrides with said particles being sized between about 10 and about 50 mesh USA sieve size with a surface roughness between 1 and about 70 microinches RMS.
Claim 3
Dependent Claim
33 words
Material according to claim 1 wherein smaller particles in the range of 270 to 600 mesh USA sieve size are mixed in with said 10 to about 50 mesh USA sieve size particles.
Claim 4
Dependent Claim
11 words
Material according to claim 1 wherein said particles are alumina particles.
Claim 5
Dependent Claim
16 words
Material according to claim 1 wherein said surface roughness is between 1 and 10 microinches RMS.
References Cited (Backward Citations)
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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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |