Patent US3987418A successfully refreshed from Google Patents.
Patent US3972694A successfully refreshed from Google Patents.
US3972694A
Expired / Lapsed
US
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Filter tube
Assignee: Whatman Ltd
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Filing: 1974-11-14
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Granted: 1976-08-03
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Expires: 1994-11-14
Abstract
Abstract A filter tube, which filter tube comprises a mass of interrelated nonwoven glass fibers, the fibers having a diameter of from about 0.001 to about 10 microns, the fibers bonded at the junctions of the fiber crossovers with a hardened silicone resin bonding agent, the fibers interrelated to form a semirigid mass of desired porosity suitable for use as a filter for gases or liquids.
Inventors
- 👤 Brian Arthur Head
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:01
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D17/00; B01D17/02; B01D17/04; B01D17/045; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A filter tube, which tube comprises a plurality of interrelated, randomly disposed inorganic glass fibers having interstices therebetween to define the porosity of the filter, the fibers having a diameter ranging from about 0.001 to about 10 microns and bonded at the junctions of the fiber crossover points with a bonding agent consisting essentially of a hardened silicone resin, the fibers interrelated to form a semirigid porous self-supporting fibrous filter tube.
Claim 2
Dependent Claim
71 words
A filter tube, which tube comprises a plurality of interrelated, randomly disposed inorganic glass fibers having interstices therebetween to define the porosity of the filter, the fibers having a diameter ranging from about 0.001 to about 10 microns and bonded at the junctions of the fiber crossover points with a bonding agent consisting essentially of a hardened silicone resin, the fibers interrelated to form a semirigid porous self-supporting fibrous filter tube.
Claim 3
Dependent Claim
14 words
The filter of claim 1 wherein the fibers are composed of borosilicate glass fibers.
Claim 4
Dependent Claim
19 words
The filter of claim 1 wherein the fibers have a diameter ranging from about 0.03 to about 8 microns.
Claim 5
Dependent Claim
42 words
The filter of claim 1 wherein the filter is in the form of a nonwoven semirigid self-supporting tube, the fibers at the ends of the tube adapted to be compressed together in a sealing relationship on the application of an axial force.
Claim 6
Dependent Claim
20 words
The filter of claim 1 wherein the bonding agent comprises from about 3 to 40% by weight of the filter.
Claim 7
Dependent Claim
16 words
The filter of claim 1 wherein the hardened silicone resin comprises a rigid cross-linked polysiloxane resin.
Claim 8
Dependent Claim
28 words
The filter tube of claim 1 which includes an outer porous filter sleeve, the filter sleeve containing a soluble dye therein to indicate the presence of liquid oil.
Claim 9
Dependent Claim
86 words
A filter tube, which tube comprises in combination: a tubular mass of interrelated, randomly disposed nonwoven glass fibers, the fibers having a diameter of from about 0.03 to 8 microns, the glass fibers bonded at the junctions of the fiber crossovers in the filter with a hardened cross-linked polysiloxane resin bonding agent in an amount ranging from about 3 to 50% by weight based on the weight of the filter, the glass fibers interrelated to form a semirigid self-supporting filter tube of the desired filtering porosity.
Claim 10
Dependent Claim
86 words
A filter tube, which tube comprises in combination: a tubular mass of interrelated, randomly disposed nonwoven glass fibers, the fibers having a diameter of from about 0.03 to 8 microns, the glass fibers bonded at the junctions of the fiber crossovers in the filter with a hardened cross-linked polysiloxane resin bonding agent in an amount ranging from about 3 to 50% by weight based on the weight of the filter, the glass fibers interrelated to form a semirigid self-supporting filter tube of the desired filtering porosity.
Claim 11
Dependent Claim
31 words
The filter tube of claim 8 which includes an outer porous filter sleeve composed of activated carbon which incorporates an organic soluble dye therein to indicate the presence of liquid oil.
Claim 12
Independent Claim
93 words
A method of filtering a steam stream at a high temperature of up to about 168°C with reduced filter tube condensate retention, which method comprises: passing the stream of steam which is desired to be filtered at a temperature of up to about 168°C and a pressure of up to 100 psig through a filter material comprising a plurality of interrelated glass fibers, the fibers bonded at the junctions of their fiber crossovers with a hardened silicone resin bonding agent, the fibers interrelated to form a semirigid porous mass of desired filtering porosity.
Claim 13
Independent Claim
93 words
A method of filtering a steam stream at a high temperature of up to about 168°C with reduced filter tube condensate retention, which method comprises: passing the stream of steam which is desired to be filtered at a temperature of up to about 168°C and a pressure of up to 100 psig through a filter material comprising a plurality of interrelated glass fibers, the fibers bonded at the junctions of their fiber crossovers with a hardened silicone resin bonding agent, the fibers interrelated to form a semirigid porous mass of desired filtering porosity.
Claim 14
Dependent Claim
39 words
The method of claim 10 wherein the filter is composed of borosilicate glass fibers having a diameter of from about 0.001 to about 10 microns, the borosilicate glass fibers bonded together by a rigid cross-linked silicone resin bonding agent.
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |