US4865922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plain bearing
Assignee: AE PLC
•
Filing: 1987-07-23
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Granted: 1989-09-12
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Expires: 2007-07-23
Abstract
Abstract A cavitation erosion resistant plain bearing comprising a steel backing, a sintered bronze interlayer and a lining of PTFE filled with 1 to 50% by volume of an ionic fluoride of low aqueous solubility.
Inventors
- 👤 Glyndwr Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:12
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C33/20; F16C33/201; C; C08; C08K; C08K3/00; C08K3/16; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; F16C2208/00; F16C2208/20; F16C2208/30; F16C2208/32; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/91; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12063; Y10T428/1209; Y10T428/12139
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
104 words
A plain bearing comprising a metal backing, a sinter layer on said metal backing and a bearing layer on said sinter layer, said bearing layer comprising a surface layer of polytetrafluoroethylene (PTFE) including 1 to 50% by volume of an ionic fluoride selected from the group consisting of CaF 2 , MgF 2 , SrF 2 and mixtures thereof precipitated from an aqueous solution and having a solubility in water which is less than 0.5 g/cm 3 at 18° C., the ionic fluoride being in a finely divided form in the PTFE, the particle size being in the range from 0.01 to 10 microns.
Claim 2
Dependent Claim
104 words
A plain bearing comprising a metal backing, a sinter layer on said metal backing and a bearing layer on said sinter layer, said bearing layer comprising a surface layer of polytetrafluoroethylene (PTFE) including 1 to 50% by volume of an ionic fluoride selected from the group consisting of CaF 2 , MgF 2 , SrF 2 and mixtures thereof precipitated from an aqueous solution and having a solubility in water which is less than 0.5 g/cm 3 at 18° C., the ionic fluoride being in a finely divided form in the PTFE, the particle size being in the range from 0.01 to 10 microns.
Claim 3
Dependent Claim
12 words
A bearing according to claim 1 wherein said backing is of steel.
Claim 4
Dependent Claim
13 words
A bearing according to claim 2 wherein said sinter layer is sintered bronze.
Claim 5
Dependent Claim
27 words
A bearing according to claim 1 wherein said fluoride is a fluoride selected from the group consisting of CaF 2 , MgF 2 and SrF 2 .
Claim 6
Dependent Claim
14 words
A bearing according to claim 4 wherein said surface layer further incorporates metallic lead.
Claim 7
Dependent Claim
24 words
A plain bearing as described in claim 1 wherein the particle size of said fluoride is in the range of 0.1 to 1 micron.
Claim 8
Dependent Claim
35 words
A plain bearing according to claim 1 wherein said fluoride is a combination of two or more of the fluorides selected from the group consisting of CaF 2 , MgF 2 and SrF 2 .
Claim 9
Dependent Claim
14 words
A plain bearing according to claim 1 wherein said fluoride is CaF 2 .
Claim 10
Dependent Claim
25 words
A plain bearing according to claim 1 wherein said fluoride is CaF 2 having a particle size in the range of 0.1 to 1 micron.
Claim 11
Dependent Claim
15 words
A bearing according to claim 1 wherein the ionic fluoride is precipitated CaF 2 .
Claim 12
Dependent Claim
27 words
A bearing according to claim 1 wherein the ionic fluoride is precipitated CaF 2 and has a particle size in the range of 0.1 to 1 micron.
Claim 13
Dependent Claim
88 words
A plain bearing comprising a metal backing, a sinter layer on said metal backing and a bearing layer on said sinter layer, said bearing layer comprising a surface layer of polytetrafluoroethylene containing from 1 to 50 volume percent of at least one ionic fluoride selected from the group consisting of CaF 2 , MgF 2 , SrF 2 and mixtures thereof having a water solubility not greater than 0.05 grams per cubic centimeter at 18° C. and a particle size in the range from 0.01 to 10 microns.
Claim 14
Dependent Claim
88 words
A plain bearing comprising a metal backing, a sinter layer on said metal backing and a bearing layer on said sinter layer, said bearing layer comprising a surface layer of polytetrafluoroethylene containing from 1 to 50 volume percent of at least one ionic fluoride selected from the group consisting of CaF 2 , MgF 2 , SrF 2 and mixtures thereof having a water solubility not greater than 0.05 grams per cubic centimeter at 18° C. and a particle size in the range from 0.01 to 10 microns.
Claim 15
Dependent Claim
14 words
A plain bearing according to claim 12 wherein said fluoride comprises CaF 2 .
Claim 16
Dependent Claim
22 words
A plain bearing according to claim 13 wherein said fluoride has a particle size in the range from 0.1 to 1 micron.
Claim 17
Dependent Claim
23 words
A plain bearing according to claim 12 wherein the particle size of said fluoride is in the range from 0.1 to 10 microns.
Claim 18
Dependent Claim
23 words
A plain bearing according to claim 12 wherein the particle size of said fluoride is in the range from 0.1 to 1 micron.
Claim 19
Dependent Claim
37 words
A plain bearing according to claim 12 wherein said fluoride is a combination of two or more of the fluorides selected from the group consisting of CaF 2 , MgF 2 , SrF 2 and mixtures thereof.
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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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |