Patent US3681853A successfully refreshed from Google Patents.
US3681853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dryer for sheet material
Assignee: Pako Corp
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Filing: 1971-03-15
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Granted: 1972-08-08
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Expires: 1991-03-15
Abstract
Abstract This is a dryer for sheet material such as photographic prints and film which is particularly constructed to handle individual relatively large size prints and includes a walking beam transfer mechanism for transporting the sheets through the drying chamber with means for circulating warm air around and over the surfaces of the prints being dried in a manner to reduce the tendency of the sheet material to curl.
Inventors
- 👤 Norman C Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:20
CPC Classifications
G; G03; G03D; G03D15/00; G03D15/02; G03D15/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
A dryer for flexible sheet material such as photographic prints and film, said dryer comprising a drying chamber with a sheet inlet opening and a sheet discharge opening therein, a substantially horizontal walking beam transport mechanism having spaced transfer members to permit the flow of heated air downwardly therethrough and including a plurality of moving transfer members engaging only the bottom side of the sheet material to be dried to transport the same through said drying chamber, means for supplying heated air to the top surface of said sheets to be dried to combine with weight of the sheets to form the only external forces urging said sheets downwardly into contact with the moving transfer members, and feeding means for delivering the sheet material through said inLet opening on to said transfer members at a speed slower than the speed at which said sheets are moved across the transport mechanism by said transfer members.
Claim 2
Dependent Claim
154 words
A dryer for flexible sheet material such as photographic prints and film, said dryer comprising a drying chamber with a sheet inlet opening and a sheet discharge opening therein, a substantially horizontal walking beam transport mechanism having spaced transfer members to permit the flow of heated air downwardly therethrough and including a plurality of moving transfer members engaging only the bottom side of the sheet material to be dried to transport the same through said drying chamber, means for supplying heated air to the top surface of said sheets to be dried to combine with weight of the sheets to form the only external forces urging said sheets downwardly into contact with the moving transfer members, and feeding means for delivering the sheet material through said inLet opening on to said transfer members at a speed slower than the speed at which said sheets are moved across the transport mechanism by said transfer members.
Claim 3
Dependent Claim
22 words
Structure set forth in claim 1 and means for varying the speed with which said sheets are transferred through said drying chamber.
Claim 4
Dependent Claim
61 words
The structure set forth in claim 1 and a pair of opposed air directing passages located on opposite sides of said drying chamber and directing heated air into the upper portion of said chamber through said opposed passages whereby the flow of air will be directed primarily downwardly to maintain contact between the sheets and the members of said transport mechanism.
Claim 5
Dependent Claim
94 words
The structure set forth in claim 1 and said bed including a plurality of spaced stationary support members interposed in laterally spaced relation between said moving transfer members, said moving members lifting said sheets out of engagement with the stationary members and subsequently re-depositing said sheets on the stationary members at an advanced position toward the discharge end of said drying chamber, the sheets being dried being free and unconfined in said chamber to produce constantly varying ''''random'''' contact areas between the lower surface of the sheets and the members of said transport mechanism.
Claim 6
Dependent Claim
56 words
The structure set forth in claim 1 and said transport mechanism members being constructed so that at least the area of contact thereof with the sheets is of a material having a low coefficient of heat conductivity to minimize localized heat transfer between the members of said transport mechanisms and the engaged portions of the sheets.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |