Patent US3823743A successfully refreshed from Google Patents.
US3823743A
Expired / Lapsed
US
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Pressure reducing device
Assignee: Dunlap Holdings Ltd
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Filing: 1971-10-26
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Granted: 1974-07-16
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Expires: 1991-10-26
Abstract
Abstract A pressure reducing device comprises an inlet for high pressure gas, an outlet for low pressure gas and a path therebetween for flow of gas from inlet to outlet, said path including at least one porous baffle having an inner portion made of porous material disposed in an inner zone of said path and an outer portion comprising a fibrous medium disposed in an outer zone of said path, the inner portion having a lower flow resistance than the outer portion. The porous materials used for the inner portion of the baffle include: layers of gauze, expanded metal, sintered metal, ceramic foams and plastics foams such as rigidified foams. The fibrous materials used for the outer portion of the baffle include; spun mineral fibers, natural fibers and glass wool.
Inventors
- 👤 C King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:49
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/027; F16L55/02745; F16L55/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
81 words
A pressure reducing device comprising an inlet for high pressure gas, an outlet for low pressure gas and a path therebetween for flow of gas from inlet to outlet, said path including at least one porous baffle having an inner portion made of porous material disposed in an inner zone of said path and an outer portion comprising a fibrous medium disposed in an outer zone of said path, the inner portion having a lower flow resistance than the outer portion.
Claim 2
Dependent Claim
81 words
A pressure reducing device comprising an inlet for high pressure gas, an outlet for low pressure gas and a path therebetween for flow of gas from inlet to outlet, said path including at least one porous baffle having an inner portion made of porous material disposed in an inner zone of said path and an outer portion comprising a fibrous medium disposed in an outer zone of said path, the inner portion having a lower flow resistance than the outer portion.
Claim 3
Dependent Claim
34 words
A pressure reducing device according to claim 1 in which the inner portion comprises a material selected from the group consisting of layers of gauze, expanded metal, sintered metal, ceramic foam and plastic foams.
Claim 4
Dependent Claim
17 words
A pressure reducing device according to claim 2 in which the inner portion comprises reticular metal foam.
Claim 5
Dependent Claim
22 words
A pressure reducing device according to claim 3 in which the reticular metal foam comprises metal deposited on a reticulated organic foam.
Claim 6
Dependent Claim
21 words
A pressure reducing device according to claim 4 in which the reticular metal foam comprises electrodeposited metal on reticulated organic foam.
Claim 7
Dependent Claim
44 words
A pressure reducing device according to claim 1 in which the porous material comprising the inner portion has a flow resistance of less than 1 psi per inch thickness in a stream of gas moving at a velocity within the range 5 to 80m/sec.
Claim 8
Dependent Claim
15 words
A pressure reducing device according to claim 1 in which the inner portion is conical.
Claim 9
Dependent Claim
16 words
A pressure reducing device according to claim 1 in which the inner portion is part spherical.
Claim 10
Dependent Claim
32 words
A pressure reducing device according to claIm 1 in which the fibrous medium in the outer portion is selected from the group consisting of spun mineral fiber, natural fiber and glass fiber.
Claim 11
Dependent Claim
37 words
A pressure reducing device according to claim 9 in which the material of the outer portion has a flow resistance in excess of 50 times that of the inner portion when measured at the same air velocity.
Claim 12
Dependent Claim
37 words
A pressure reducing device according to claim 9 in which the material of the outer portion has a flow resistance in excess of 100 times that of the inner portion when measured at the same air velocity.
Claim 13
Dependent Claim
22 words
A pressure reducing device according to claim 1 in which the inner and outer portions are separated by a perforated sheet baffle.
Claim 14
Dependent Claim
29 words
A pressure reducing device according to claim 12 in which the perforated sheet baffle comprises a material selected from the group consisting of metal, plastic material and woven fabric.
Claim 15
Dependent Claim
19 words
A pressure reducing device according to claim 12 in which the perforated sheet baffle is covered with fine cloth.
Claim 16
Dependent Claim
91 words
A gas pressure reducing device, comprising: an inlet for high pressure gas; an outlet for low pressure gas, the area of said outlet being larger than the area of said inlet; a porous baffle between said inlet and said outlet, said baffle comprising an inner portion of porous material whose cross-sectional area increases progressively along an axis in the direction from said inlet to said outlet; an outer portion comprising a fibrous medium radially surrounding said inner portion; said inner portion having a lower gas flow resistance than said outer portion.
Claim 17
Dependent Claim
91 words
A gas pressure reducing device, comprising: an inlet for high pressure gas; an outlet for low pressure gas, the area of said outlet being larger than the area of said inlet; a porous baffle between said inlet and said outlet, said baffle comprising an inner portion of porous material whose cross-sectional area increases progressively along an axis in the direction from said inlet to said outlet; an outer portion comprising a fibrous medium radially surrounding said inner portion; said inner portion having a lower gas flow resistance than said outer portion.
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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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |