Patent US4431698A successfully refreshed from Google Patents.
US4431698A
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Waterproof packing
Assignee: MARLO Co INCORPORATED A CORP OF NY
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Filing: 1982-09-30
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Granted: 1984-02-14
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Expires: 2002-09-30
Abstract
Abstract A low-friction, water- and steam-resistant packing suitable for both static and dynamic applications includes inorganic fiber selected from the group consisting of chemical, electrical, structural and alkali resistant glasses, ceramic, quartz, carbon and graphite materials, and dispersed and dried, but unsintered, polytetrafluoroethylene (TFE). The packing is essentially free of wetting agent and is prepared by combining the inorganic fiber with a TFE dispersion containing a wetting agent and heating the resulting combination to a temperature high enough to decompose the wetting agent but insufficiently high to sinter the particles of the dispersion.
Inventors
- 👤 Edward M. Case
- 👤 Chester S. Hopper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:06
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20; F16J15/22; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/937; Y10S277/944; Y10S277/945; Y10S277/946; Y10S384/00; Y10S384/90; Y10S384/908; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249949; Y10T428/24995; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T442/00; Y10T442/20; Y10T442/2311; Y10T442/232; Y10T442/2861; Y10T442/2926; Y10T442/2975; Y10T442/2984; Y10T442/2992
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
53 words
A low-friction, water and steam-resistant packing suitable for both static and dynamic applications, said packing comprising inorganic fiber selected from the group consisting of chemical, electrical, structural and alkali resistant glasses, ceramic, quartz, carbon and graphite materials and dispersed and dried but unsintered polytetrafluoroethylene (TFE), said packing being essentially free of wetting agent.
Claim 2
Dependent Claim
53 words
A low-friction, water and steam-resistant packing suitable for both static and dynamic applications, said packing comprising inorganic fiber selected from the group consisting of chemical, electrical, structural and alkali resistant glasses, ceramic, quartz, carbon and graphite materials and dispersed and dried but unsintered polytetrafluoroethylene (TFE), said packing being essentially free of wetting agent.
Claim 3
Dependent Claim
15 words
The packing as defined in claim 1, wherein said material is one of said glasses.
Claim 4
Dependent Claim
13 words
The packing as defined in claim 2, wherein said glass fiber is texturized.
Claim 5
Dependent Claim
17 words
The packing as defined in claim 1, wherein said material is graphite in the form of fiber.
Claim 6
Dependent Claim
29 words
The packing as defined in any of claims 1, 2, 3 or 4, wherein said dispersed TFE amounts to from 5% to 100% of the weight of said fiber.
Claim 7
Dependent Claim
28 words
The packing as defined in claims 1, 2, 3 or 4 wherein said dispersed TFE amount to from 5 to 20% based on the weight of said fiber.
Claim 8
Dependent Claim
16 words
The packing as defined in claim 1 or 2, further comprising the inorganic lubricant, dispersed graphite.
Claim 9
Dependent Claim
27 words
The packing as defined in claim 7, wherein said dispersed graphite is present in an amount from 5% to 100% based on the weight of said fiber.
Claim 10
Dependent Claim
26 words
The packing as defined in claim 1, wherein said content of said dispersed graphite is from 5% to 50% based on the weigh of said fiber.
Claim 11
Dependent Claim
30 words
The packing as defined in claim 1, further comprising an organic fiber sufficiently stable thermally to withstand the temperature necessary to decompose wetting agent initially present in said dispersed TFE.
Claim 12
Dependent Claim
14 words
The packing as defined in claim 10, wherein said organic fiber is TFE fiber.
Claim 13
Dependent Claim
13 words
The packing as defined in claim 10, wherein said organic fiber is aramid.
Claim 14
Dependent Claim
24 words
The packing as defined in claim 10, wherein said organic fiber amounts to from 5 to 100% of the weight of said inorganic fiber.
Claim 15
Dependent Claim
23 words
The packing as defined in claim 13 wherein said organic fiber amounts from 5 to 50% of the weight of said inorganic fiber.
Claim 16
Dependent Claim
27 words
The packing as defined in claim 10, wherein said packing further comprises dispersed graphite in an amount from 5 to 100% of the weight of said fibers.
Claim 17
Dependent Claim
27 words
The packing as defined in claim 10 wherein said packing further comprises dispersed graphite in an amount from 5 to 50% of the weight of said fibers.
Claim 18
Independent Claim
72 words
A method of preparing a low-friction, water and steam-resistant packing comprising the steps of combining an inorganic fiber of a material selected from the group consisting of chemical, electrical, structural and alkali-resistant glasses, ceramic, quartz, carbon and graphite, with a polytetrafluoroethylene (TFE) dispersion containing a wetting agent, and heating the resulting combination to a temperature high enough to decompose the wetting agent but insufficiently high to sinter the particles of the dispersion.
Claim 19
Independent Claim
72 words
A method of preparing a low-friction, water and steam-resistant packing comprising the steps of combining an inorganic fiber of a material selected from the group consisting of chemical, electrical, structural and alkali-resistant glasses, ceramic, quartz, carbon and graphite, with a polytetrafluoroethylene (TFE) dispersion containing a wetting agent, and heating the resulting combination to a temperature high enough to decompose the wetting agent but insufficiently high to sinter the particles of the dispersion.
Claim 20
Dependent Claim
31 words
The method as defined in claim 17, further comprising the step of combining a graphite dispersion with said inorganic fiber and said TFE dispersion prior to said heating of said combination.
Claim 21
Dependent Claim
35 words
The method as defined in claim 17, further comprising the step of adding to said combination prior to said heating step a quantity of an organic fiber sufficiently stable thermally to withstand said heating step.
Claim 22
Dependent Claim
30 words
The method as defined in claim 17, 18 or 19, wherein said fiber is TFE fiber in an amount from 5 to 100% based on the weight of said packing.
Claim 23
Dependent Claim
30 words
The method as defined in claim 17, 18 or 19, wherein said fiber is aramid fiber in an amount from 5 to 100% based on the weight of said packing.
Claim 24
Dependent Claim
28 words
The method as defined in claim 18 or 19 wherein said graphite is present in an amount from 5 to 100% based on the weight of said fiber.
Claim 25
Dependent Claim
28 words
The method as defined in claim 18 or 19 wherein said graphite is present in an amount from 5 to 50% based on the weight of said fiber.
Claim 26
Dependent Claim
22 words
The method as defined in claim 17, wherein said decomposition step is effected at a temperature between 375° F. and 650° F.
Claim 27
Dependent Claim
46 words
The method as defined in claim 17, 18 or 19 wherein said fiber is treated with a lubricant prior to forming said fiber into a packing, said lubricant being a member of the group consisting of TFE dispersion and TFE dispersion in combination with dispersed graphite.
References Cited (Backward Citations)
US3306155A
Cited
US4163825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |