US4051275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Embedding and compacting particles in porous surfaces
Assignee: Individual
•
Filing: 1976-03-03
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Granted: 1977-09-27
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Expires: 1996-03-03
Abstract
Abstract The process described herein involves a method of compacting and increasing the amount of particles, such as polytetrafluoroethylene, etc., deposited in fissures in a surface which involves heating the surface to expand the size of the fissures or pores in the surface, then depositing in the expanded fissures finely divided particles at a temperature at least 100° F, preferably at least 300° F below the temperature of the surface, and subsequently permitting the temperature of the surface and of the particles to come to equilibrium whereby the particles are locked into the fissures by interference fit. The surface is then subjected to a blasting fluid stream carrying finely divided particles applied at a pressure of 30-120 psi, preferably 40-80 psi, to compact the particles in the fissures, after which the original treatment is repeated by heating the surface, depositing additional finely divided particles at a temperature at least 100° F below the temperature of the surface so that the additional particles are also locked into the fissures. The blasting operation and subsequent treatment to lock additional particles in the fissures improves markedly the useful life of the treated surface.
Inventors
- 👤 Clarence W. Forestek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:05
CPC Classifications
B; B05; B05D; B05D5/00; B05D5/08; B05D5/083; B29; B29C; B29C33/00; B29C33/56; B29C33/60; C; C23; C23C; C23C24/00; B05D2202/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/12104; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
266 words
In the process for preparing a metallic surface having pores in which particles are embedded therein which comprises: a. heating a porous metallic surface to at least 100° F and not more than 650° F to enlarge the pores thereof, said pores initially having an average width not greater than 100 microns; b. promptly thereafter depositing finely divided particles having an average size no greater than 50 microns onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° F below the temperature of said heated surface and being selected from the class consisting of perfluorocarbon polymers, elemental metals, metal oxides, metal nitrides, metal carbides and metal disulfides; and c. permitting said surface and particles to reach room temperature thereby to lock said particles into said pores; the improvement comprising: d. subjecting a surface produced according to steps (a), (b) and (c) to a fluid stream having finely divided solid particles suspended therein at a pressure of 30-120 psi for a sufficient period to compact the embedded particles, said suspended particles having an average size no greater than 50 microns; e. thereafter heating said surface to a temperature of at least 100° F. f. promptly thereafter depositing additional finely divided particles similar to those already embedded in said pores onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° F below the temperature of said heated surface; and g. permitting said surface and particles to reach temperature equilibrium, thereby to lock said additional particles into said pores.
Claim 2
Dependent Claim
266 words
In the process for preparing a metallic surface having pores in which particles are embedded therein which comprises: a. heating a porous metallic surface to at least 100° F and not more than 650° F to enlarge the pores thereof, said pores initially having an average width not greater than 100 microns; b. promptly thereafter depositing finely divided particles having an average size no greater than 50 microns onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° F below the temperature of said heated surface and being selected from the class consisting of perfluorocarbon polymers, elemental metals, metal oxides, metal nitrides, metal carbides and metal disulfides; and c. permitting said surface and particles to reach room temperature thereby to lock said particles into said pores; the improvement comprising: d. subjecting a surface produced according to steps (a), (b) and (c) to a fluid stream having finely divided solid particles suspended therein at a pressure of 30-120 psi for a sufficient period to compact the embedded particles, said suspended particles having an average size no greater than 50 microns; e. thereafter heating said surface to a temperature of at least 100° F. f. promptly thereafter depositing additional finely divided particles similar to those already embedded in said pores onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° F below the temperature of said heated surface; and g. permitting said surface and particles to reach temperature equilibrium, thereby to lock said additional particles into said pores.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which both the deposited and the suspended compacting particles are perfluorocarbon polymer particles.
Claim 4
Dependent Claim
18 words
The process of claim 1 in which both the deposited and the suspended compacting particles are polytetrafluoroethylene particles.
Claim 5
Dependent Claim
13 words
The process of claim 3 in which said porous surface is hard chromium.
Claim 6
Dependent Claim
20 words
The process of claim 1 in which said fluid stream is an air stream having the compacting particles suspended thereby.
Claim 7
Dependent Claim
22 words
The process of claim 1 in which said fluid stream is an air stream carrying an aqueous suspension of the compacting particles.
Claim 8
Dependent Claim
22 words
The process of claim 3 in which said fluid stream is an air stream carrying an aqueous suspension of said compacting particles.
Claim 9
Dependent Claim
13 words
The process of claim 7 in which said air pressure is 40-80 psi.
Claim 10
Dependent Claim
39 words
The process of claim 1 in which said surface is heated to a temperature of at least 150° F and the temperature differential between that of the surface and that of the deposited particles is at least 300° F.
Claim 11
Dependent Claim
19 words
The process of claim 9 in which both the deposited and the suspended compacting particles are perfluorocarbon polymer particles.
Claim 12
Dependent Claim
18 words
The process of claim 9 in which both the deposited and the suspended compacting particles are polytetrafluoroethylene particles.
Claim 13
Dependent Claim
13 words
The process of claim 11 in which said porous surface is hard chromium.
Claim 14
Dependent Claim
22 words
The process of claim 11 in which said fluid stream is an air stream carrying an aqueous suspension of said compacting particles.
Claim 15
Dependent Claim
17 words
The process of claim 13 in which said compacting particles have an average size of 0.05-50 microns.
Claim 16
Dependent Claim
17 words
The process of claim 14 in which said stream is applied at a pressure of 40-80 psi.
Claim 17
Dependent Claim
299 words
In the process for preparing a metallic surface having pores in which particles are embedded therein which comprises: a. heating a porous metallic surface to at least 100° F and not more than 650° F to enlarge the pores thereof, said pores having an average width not greater than 100 microns; b. promptly thereafter depositing finely divided particles having an average size no greater than 50 microns onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° below the temperature of said heated surface and being selected from the class consisting of perfluorocarbon polymers, elemental metals, metal oxides, metal nitrides, metal carbides and metal disulfides, whereby said metallic surface after said depositing is well above room temperature; the improvement comprising: c. applying to a surface produced according to steps (a) and (b) a fluid stream, said fluid stream having a temperature equal to or below room temperature, a pressure of 30-120 psi, and having suspended therein finely divided particles of an average size no greater than 50 microns, said stream being applied for a sufficient period to compact the embedded particles and cool the said surface so that the surface and particles reach a temperature equal to or below room temperature whereby the said embedded particles are locked into the said pores; d. thereafter heating said surface to a temperature of at least 100° F. e. promptly thereafter depositing additional finely divided particles similar to those already embedded in said pores onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° F below the temperature of said heated surface; and f. permitting said surface and particles to reach temperature equilibrium, thereby to lock said additional particles into said pores.
Claim 18
Dependent Claim
299 words
In the process for preparing a metallic surface having pores in which particles are embedded therein which comprises: a. heating a porous metallic surface to at least 100° F and not more than 650° F to enlarge the pores thereof, said pores having an average width not greater than 100 microns; b. promptly thereafter depositing finely divided particles having an average size no greater than 50 microns onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° below the temperature of said heated surface and being selected from the class consisting of perfluorocarbon polymers, elemental metals, metal oxides, metal nitrides, metal carbides and metal disulfides, whereby said metallic surface after said depositing is well above room temperature; the improvement comprising: c. applying to a surface produced according to steps (a) and (b) a fluid stream, said fluid stream having a temperature equal to or below room temperature, a pressure of 30-120 psi, and having suspended therein finely divided particles of an average size no greater than 50 microns, said stream being applied for a sufficient period to compact the embedded particles and cool the said surface so that the surface and particles reach a temperature equal to or below room temperature whereby the said embedded particles are locked into the said pores; d. thereafter heating said surface to a temperature of at least 100° F. e. promptly thereafter depositing additional finely divided particles similar to those already embedded in said pores onto said heated surface and working said particles into said pores, said particles being at a temperature at least 100° F below the temperature of said heated surface; and f. permitting said surface and particles to reach temperature equilibrium, thereby to lock said additional particles into said pores.
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |