US4304985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer for dry silver paper
Assignee: United States Department of the Navy
•
Filing: 1980-05-27
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Granted: 1981-12-08
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Expires: 2000-05-27
Abstract
Abstract A thermal processing device for dry photographic paper using a minimum amt of electrical energy. A cylindrical drum is provided with heating elements on the inside surface and current is applied through a slip ring assembly. A non-metallic belt, substantially equal in width to the length of the cylindrical drum, is supported by rollers so that a portion of the belt engages the cylindrical drum. Rotation of the cylindrical drum causes rotation of the belt and a sheet of paper fed into the device is sandwiched between the belt and drum and is heated thereby to develop the dry photographic paper.
Inventors
- 👤 William H. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:24
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A developer for dry silver photographic paper comprising, a housing, a hollow metallic cylindrical roller, heating elements positioned on the inside surface of said hollow metallic cylinder, bearing means in said housing for rotatably supporting a first end of said hollow metallic cylindrical roller, a slip ring assembly positioned inside said hollow metallic cylindrical roller for rotatably supporting a second end of said hollow metallic cylindrical roller and for connecting current with said heating elements, drive means coupled to said hollow metallic cylinder, a non-metallic belt substantially equal in width to the length of said hollow metallic cylinder roller, and at least three cylindrical support rollers supporting said belt in engagement with a portion of said hollow metallic cylindrical roller whereby rotation of said hollow metallic cylindrical roller causes movement of said belt to move a sheet of photographic paper between said belt and said hollow metallic cylindrical roller whereby said sheet of photographic paper is heated.
Claim 2
Dependent Claim
157 words
A developer for dry silver photographic paper comprising, a housing, a hollow metallic cylindrical roller, heating elements positioned on the inside surface of said hollow metallic cylinder, bearing means in said housing for rotatably supporting a first end of said hollow metallic cylindrical roller, a slip ring assembly positioned inside said hollow metallic cylindrical roller for rotatably supporting a second end of said hollow metallic cylindrical roller and for connecting current with said heating elements, drive means coupled to said hollow metallic cylinder, a non-metallic belt substantially equal in width to the length of said hollow metallic cylinder roller, and at least three cylindrical support rollers supporting said belt in engagement with a portion of said hollow metallic cylindrical roller whereby rotation of said hollow metallic cylindrical roller causes movement of said belt to move a sheet of photographic paper between said belt and said hollow metallic cylindrical roller whereby said sheet of photographic paper is heated.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |