Patent US4679402A successfully refreshed from Google Patents.
US4679402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling heat exchanger
Assignee: Azenta Inc
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Filing: 1986-08-11
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Granted: 1987-07-14
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Expires: 2006-08-11
Abstract
Abstract A cooling heat exchanger such as a cold trap for removing contaminants from a vapor stream. Vapor flows through a conduit having angled baffles therein. The baffles are aligned within the conduit so as to form an optically dense trap. A cold region is created by placing a cold finger of a cryogenic refrigerator in contact with a sleeve surrounding the conduit adjacent to the baffles. Insulation of the cold region to maintain cryogenic temperatures is accomplished by insulation within an insulating container surrounding the cold region.
Inventors
- 👤 Bruce R. Andeen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:16
CPC Classifications
B; B01; B01D; B01D8/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
95 words
A cooling heat exchanger assembly, comprising: a. a flow through conduit of low thermal conductivity material; b. an optically dense center portion of the conduit; c. a container surrounding the conduit such that an insulating volume filled with solid insulation is created between the conduit and the container; and d. a cryogenic refrigerator having a piston which reciprocates in a cylinder to expand and thus cool gas in an expansion space at the end of the cylinder, the cylinder extending through the container such that its cold end is in thermal contact with the conduit.
Claim 2
Dependent Claim
95 words
A cooling heat exchanger assembly, comprising: a. a flow through conduit of low thermal conductivity material; b. an optically dense center portion of the conduit; c. a container surrounding the conduit such that an insulating volume filled with solid insulation is created between the conduit and the container; and d. a cryogenic refrigerator having a piston which reciprocates in a cylinder to expand and thus cool gas in an expansion space at the end of the cylinder, the cylinder extending through the container such that its cold end is in thermal contact with the conduit.
Claim 3
Dependent Claim
59 words
A cooling heat exchanger assembly as claimed in claim 1, further comprising a sleeve of high thermal conductivity material which is in close thermal contact with the cold end of the refrigerator and which surrounds the center portion of the conduit adjacent to the baffles such that it is in close thermal contact with the optically dense center portion.
Claim 4
Dependent Claim
19 words
A cooling heat exchanger assembly as claimed in claim 1, wherein the cooling heat exchanger is a cold trap.
Claim 5
Dependent Claim
59 words
A cooling heat exchanger assembly as claimed in claim 3, further comprising a sleeve of high thermal conductivity material which is in close thermal contact with the cold end of the refrigerator and which surrounds the center portion of the conduit adjacent to the baffles such that it is in close thermal contact with the optically dense center portion.
Claim 6
Dependent Claim
19 words
A cooling heat exchanger assembly as claimed in claim 1, further comprising a heat tape wrapped around the sleeve.
Claim 7
Dependent Claim
21 words
A cooling heat exchanger assembly as claimed in claim 1, wherein baffles are located in the center portion of the conduit.
Claim 8
Dependent Claim
20 words
A cooling heat exchanger assembly as claimed in claim 6, wherein the baffles are obliquely angled relative to the conduit.
Claim 9
Dependent Claim
16 words
A cooling heat exchanger assembly as claimed in claim 1, wherein the solid insulation is fiberglass.
Claim 10
Dependent Claim
17 words
A cooling heat exchanger assembly as claimed in claim 1, wherein the solid insulation is expanded foam.
Claim 11
Dependent Claim
113 words
A cooling heat exchanger assembly comprising: a. a flow through conduit of low thermal conductivity material; b. baffles located within a center portion of the conduit; c. a sleeve of high thermal conductivity material adjacent to and in close thermal contact with the baffles; d. a container surrounding the conduit and the sleeve such that an insulating volume is created between the conduit and the container; and e. a cryogenic refrigerator having a piston which reciprocates in a cylinder to expand and thus cool gas in an expansion space at the end of the cylinder, the cylinder extending through the container such that its cold end is in thermal contact with the sleeve.
Claim 12
Dependent Claim
113 words
A cooling heat exchanger assembly comprising: a. a flow through conduit of low thermal conductivity material; b. baffles located within a center portion of the conduit; c. a sleeve of high thermal conductivity material adjacent to and in close thermal contact with the baffles; d. a container surrounding the conduit and the sleeve such that an insulating volume is created between the conduit and the container; and e. a cryogenic refrigerator having a piston which reciprocates in a cylinder to expand and thus cool gas in an expansion space at the end of the cylinder, the cylinder extending through the container such that its cold end is in thermal contact with the sleeve.
Claim 13
Dependent Claim
19 words
A cooling heat exchanger assembly as claimed in claim 10, wherein the cooling heat exchanger is a cold trap.
Claim 14
Dependent Claim
19 words
A cooling heat exchanger assembly as claimed in claim 10, further comprising a heat tape wrapped around the sleeve.
Claim 15
Dependent Claim
20 words
A cooling heat exchanger assembly as claimed in claim 10, wherein the baffles are obliquely angled relative to the conduit.
Claim 16
Dependent Claim
16 words
A cooling head exchanger assembly as claimed in claim 10, wherein the solid insulation is fiberglass.
Claim 17
Dependent Claim
17 words
A cooling head exchanger assembly as claimed in claim 10, wherein the solid insulation is expanded foam.
Claim 18
Dependent Claim
110 words
A cold trap comprising: a. a flow through conduit of low thermal conductivity material; b. baffles located within the conduit; c. a sleeve of high thermal conductivity material adjacent to and in close thermal contact with the baffles; d. a container surrounding the conduit and sleeve such that an insulating volume filled with solid insulation is created between the conduit and the container; and e. a cryogenic refrigerator having a piston which reciprocates in a cylinder to expand and thus cool gas in an expansion space at the end of the cylinder, the cylinder extending through the container such that its cold end is in thermal contact with the sleeve.
Claim 19
Dependent Claim
110 words
A cold trap comprising: a. a flow through conduit of low thermal conductivity material; b. baffles located within the conduit; c. a sleeve of high thermal conductivity material adjacent to and in close thermal contact with the baffles; d. a container surrounding the conduit and sleeve such that an insulating volume filled with solid insulation is created between the conduit and the container; and e. a cryogenic refrigerator having a piston which reciprocates in a cylinder to expand and thus cool gas in an expansion space at the end of the cylinder, the cylinder extending through the container such that its cold end is in thermal contact with the sleeve.
Claim 20
Dependent Claim
17 words
A cold trap as claimed in claim 16, further comprising a heat tape wrapped around the sleeve.
Claim 21
Dependent Claim
18 words
A cold trap as claimed in claim 16, wherein the baffles are obliquely angled relative to the conduit.
Claim 22
Dependent Claim
14 words
A cold trap as claimed in claim 16, wherein the solid insulation is fiberglass.
Claim 23
Dependent Claim
15 words
A cold trap as claimed in claim 16, wherein the solid insulation is expanded foam.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |