US4543737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for distributing steam on a paper web
Assignee: Honeywell Measurex Corp
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Filing: 1984-03-14
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Granted: 1985-10-01
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Expires: 2004-03-14
Abstract
Abstract The specification discloses a steam distributor having a chamber to contain steam on one side of a paper web and a vacuum box on the opposite side of the paper web. The chamber has a vacuum release means to prevent the chamber from being pulled onto the paper web if vacuum is applied when steam is not applied.
Inventors
- 👤 Mathew Boissevain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:01
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/003; D21F5/00; D21F5/18; D21F7/008
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A system for distributing steam on a paper web, the system comprising: (a) a hood located to one side of the paper web; (b) means to introduce steam into the hood; (c) vacuum box means located to the side of the web opposite said hood to apply a vacuum to the web; (d) vacuum release means coupled to said hood to: (i) provide a space between the paper web and the vacuum release means, the space having a predetermined first height to restrict the flow of air into said hood when steam is being introduced to said hood; and (ii) provide a space between the paper web and the vacuum release means, the space having a height greater than the predetermined first height to permit a substantial flow of air to enter said hood when vacuum is applied to said vacuum box means while steam is not being introduced into said hood.
Claim 2
Independent Claim
152 words
A system for distributing steam on a paper web, the system comprising: (a) a hood located to one side of the paper web; (b) means to introduce steam into the hood; (c) vacuum box means located to the side of the web opposite said hood to apply a vacuum to the web; (d) vacuum release means coupled to said hood to: (i) provide a space between the paper web and the vacuum release means, the space having a predetermined first height to restrict the flow of air into said hood when steam is being introduced to said hood; and (ii) provide a space between the paper web and the vacuum release means, the space having a height greater than the predetermined first height to permit a substantial flow of air to enter said hood when vacuum is applied to said vacuum box means while steam is not being introduced into said hood.
Claim 3
Dependent Claim
32 words
A system according to claim 1 wherein said hood has two side walls and two end walls, and said vacuum release means is coupled to at least one of said side walls.
Claim 4
Dependent Claim
64 words
A system according to claim 2 wherein, (a) said hood further includes at least one diffusing plate; (b) said means to introduce steam into said hood is coupled to said hood on the side of said diffusing plate opposite the paper web; (c) said vacuum release means is coupled to said hood on the side of said diffusing plates opposite said steam introduction means.
Claim 5
Dependent Claim
60 words
A system according to claim 2 wherein said hood is spaced apart from the paper web to form a space therebetween and said vacuum release means includes a plate coupled by a hinge to one of said side walls, said plate being constructed and arranged so that the plate substantially closes the space when steam is introduced into said hood.
Claim 6
Dependent Claim
43 words
A system according to claim 4 wherein said plate is constructed and arranged so that when steam is not being introduced into said hood and vacuum is applied to said vacuum box means the vacuum causes said plate to substantially uncover the space.
Claim 7
Dependent Claim
29 words
A system according to claim 4 further including a stop member coupled to said plate to prevent said plate from uncovering the space under conditions of high steam pressure.
Claim 8
Dependent Claim
15 words
A system according to claim 1 wherein the predetermined first height is about 0.75 inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |