US3581257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic holding drum
Assignee: ELECTRONIC TRANSMISSION SYSTEM
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Filing: 1969-10-29
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Granted: 1971-05-25
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Expires: 1989-10-29
Abstract
Abstract A magnetic holding drum particularly suitable for optical reproduction devices such as facsimile transmitters, which enables the copy to be held substantially flat over the surface of the drum while the drum is either rotated or optically scanned. The drum includes a plurality of spaced-apart, radially disposed elongated magnets on its cylindrical surface. A sliding holder which is slidably retained in grooves at each end of the drum is magnetically affixed at any desired position on the surface of the drum in order to maintain the copy flattened against the drum''s surface.
Inventors
- 👤 Edmund F Priessnetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:24
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/06; H04N1/08; H04N1/0804; H04N1/0813; H01; H01F; H01F7/00; H01F7/02; H01F7/0231; H01F7/0252; H01F7/0268; H04N1/083; H04N1/0839; H04N1/0847
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A device for holding a copy material comprising: a drum having a substantially cylindrical surface, clamp means for retaining one edge of said copy material, sliding means for retaining the other edge of said copy material, and, magnetic means secured to said drum surface for magnetically engaging said clamp means to said drum surface.
Claim 2
Independent Claim
54 words
A device for holding a copy material comprising: a drum having a substantially cylindrical surface, clamp means for retaining one edge of said copy material, sliding means for retaining the other edge of said copy material, and, magnetic means secured to said drum surface for magnetically engaging said clamp means to said drum surface.
Claim 3
Dependent Claim
30 words
The device as recited in claim 1, wherein said magnetic means comprises at least one magnetic strip disposed within the surface of said drum and substantially parallel to its axis.
Claim 4
Dependent Claim
46 words
The device as recited in claim 2, wherein said drum additionally comprises a pair of end flanges secured to the ends of said drum, an annular groove formed in each of said flanges and directed toward said drum surface, said grooves slidably retaining said sliding means.
Claim 5
Dependent Claim
27 words
The device as recited in claim 3, wherein said clamp means additionally comprises pivot means secured to each end and pivotably coupled to each of said flanges.
Claim 6
Dependent Claim
33 words
The device as recited in claim 4, wherein said clamp means and said sliding element are constructed from paramagnetic material, and said magnetic strip is disposed for magnetic engagement with said sliding means.
Claim 7
Dependent Claim
23 words
The device as recited in claim 1, wherein said magnetic means comprises a plurality of permanent magnet strips embedded in said drum surface.
Claim 8
Dependent Claim
17 words
The device as recited in claim 6, wherein said drum surface is constructed from a nonmagnetic material.
References Cited (Backward Citations)
US3039389A
Cited
US3353481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |