Patent US4557057A successfully refreshed from Google Patents.
US4557057A
Expired / Lapsed
US
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Apparatus for the drying of tobacco materials
Assignee: British American Tobacco Germany GmbH
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Filing: 1984-02-07
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Granted: 1985-12-10
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Expires: 2004-02-07
Abstract
Abstract A stream dryer comprises in addition to the control bypass which bypasses the heat source a second ready-use bypass which is in parallel with the control bypass and bypasses the heat source. In the event of short-duration interruptions in working, the supply of steam is interrupted and the circulation of the hot gas is maintained substantially only through the ready-use bypass, so that the temperature of the circulated hot gas substantially does not change when the relatively small heat losses due to surface and exhaust gas losses are compensated. Temperature regulation is effected through the agency of the control bypass in this state of readiness also.
Inventors
- 👤 Arno Weiss
- 👤 Horst Gaisser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:11
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/10; F26B21/00; F26B21/30; F26B21/35; F26B2200/00; F26B2200/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
227 words
An apparatus for the drying of tobacco materials comprising: (a) an endless conveying system for circulating a mixture of hot gas and steam; (b) a consumer apparatus in said conveying system which includes (1) means for feeding and entraining tobacco materials to be dried into the circulating mixture of hot gas and steam, and (2) means for separating the dried tobacco materials from the circulating mixture of hot gas and steam; (c) a heat source in said conveying system, (d) a first control bypass connected to said conveying system bypassing around said heat source and having means for adjusting throughflow quantity for regulating temperature of the circulating mixture of hot gas and steam; (e) means for feeding steam to said conveying system including a first shutoff element; (f) a second, ready-use, full-flow bypass connected to said conveying system around said heat source in parallel to said first control bypass; (g) a second shutoff element positioned in said conveying system between said heat source and said first and second bypasses; (h) a third shutoff element positioned in said second bypass; and (i) means operatively connected to said second and third shutoff elements for controlling flow of the circulating mixture of hot gas and steam such that the mixture either substantially completely flows through said heat source or substantially completely flows through said second bypass bypassing said heat source.
Claim 2
Independent Claim
227 words
An apparatus for the drying of tobacco materials comprising: (a) an endless conveying system for circulating a mixture of hot gas and steam; (b) a consumer apparatus in said conveying system which includes (1) means for feeding and entraining tobacco materials to be dried into the circulating mixture of hot gas and steam, and (2) means for separating the dried tobacco materials from the circulating mixture of hot gas and steam; (c) a heat source in said conveying system, (d) a first control bypass connected to said conveying system bypassing around said heat source and having means for adjusting throughflow quantity for regulating temperature of the circulating mixture of hot gas and steam; (e) means for feeding steam to said conveying system including a first shutoff element; (f) a second, ready-use, full-flow bypass connected to said conveying system around said heat source in parallel to said first control bypass; (g) a second shutoff element positioned in said conveying system between said heat source and said first and second bypasses; (h) a third shutoff element positioned in said second bypass; and (i) means operatively connected to said second and third shutoff elements for controlling flow of the circulating mixture of hot gas and steam such that the mixture either substantially completely flows through said heat source or substantially completely flows through said second bypass bypassing said heat source.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1 wherein the heat source is a heat exchanger operating in countercurrent.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 2 wherein the heat source is a shell-and-tubes heat exchanger.
Claim 5
Independent Claim
28 words
An apparatus according to one of claims 2 or 3 wherein the second shutoff element is situated at the onflow side of the heat exchanger between the bypasses.
Claim 6
Dependent Claim
26 words
An apparatus according to claim 2 wherein the second shutoff element has two positions, which are a completely opened position and a position with slight throughflow.
Claim 7
Independent Claim
27 words
An apparatus according to one of claims 2 or 3 wherein the second shutoff element is situated at the offlowside of the heat exchanger between the bypasses.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 6, wherein the second shutoff element has two positions which are a completely opened position and a position with slight throughflow.
Claim 9
Dependent Claim
17 words
An apparatus according to claim 1, wherein the heat source is a heat exchanger operating in cross-flow.
Claim 10
Dependent Claim
15 words
An apparatus according to claim 8 wherein the heat source is a shell-and-tubes heat exchanger.
Claim 11
Independent Claim
28 words
An apparatus according to one of claims 8 or 9 wherein the second shutoff element is situated at the offlow side of the heat exchanger between the bypasses.
Claim 12
Independent Claim
28 words
An apparatus according to one of claims 8 or 9 wherein the second shutoff element is situated at the onflow side of the heat exchanger between the bypasses.
Claim 13
Dependent Claim
26 words
An apparatus according to claim 1, wherein the second shutoff element has two positions which are a completely opened position and a position with slight throughflow.
Claim 14
Dependent Claim
26 words
An apparatus according to claim 10, wherein the second shutoff element has two positions which are a completely opened position and a position with slight throughflow.
Claim 15
Dependent Claim
26 words
An apparatus according to claim 11, wherein the second shutoff element has two positions which are a completely opened position and a position with slight throughflow.
Claim 16
Dependent Claim
26 words
An apparatus according to claim 4, wherein the second shutoff element has two positions which are a completely opened position and a position with slight throughflow.
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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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |