Patent US2736166A successfully refreshed from Google Patents.
US3721189A
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US
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Magnetic print cylinder
Assignee: Magna Graphics Corp
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Filing: 1971-06-28
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Granted: 1973-03-20
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Expires: 1991-06-28
Abstract
Abstract A magnetic print cylinder for use with flexible, magnetizable printing plates, the cylinder having a plurality of axially extending, magnetic assemblies mounted in a side-by-side relation on the surface thereof, each of the assemblies including a channel member of magnetic flux insulating material, a plurality of permanent magnetic parts aligned in a spaced relation in the channel member, and a magnetizable pole piece positioned between each pair of magnets, the outer surface of the magnetic assemblies forming the plate mounting surface for the printing plates.
Inventors
- 👤 A Bray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:21
CPC Classifications
B; B41; B41F; B41F27/00; B41F27/02; Y; Y10; Y10S; Y10S425/00; Y10S425/033; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
In a printing cylinder for use with flexible, magnetizable printing plates, a plate cylinder and a plurality of axially extending magnetic assemblies mounted in a side-by-side relation on the surface of said plate cylinder, each of said assemblies comprising: a channel member having generally radially extending side walls positioned for abutting engagement with adjacent members, a plurality of permanent magnetic parts and magnetizable pole pieces alternately arranged in said channel member, and means for locking the magnetic parts and pole pieces in the channel member, said channel member having an outer surface which forms a continuous face for supporting printing plates on the cylinder.
Claim 2
Dependent Claim
104 words
In a printing cylinder for use with flexible, magnetizable printing plates, a plate cylinder and a plurality of axially extending magnetic assemblies mounted in a side-by-side relation on the surface of said plate cylinder, each of said assemblies comprising: a channel member having generally radially extending side walls positioned for abutting engagement with adjacent members, a plurality of permanent magnetic parts and magnetizable pole pieces alternately arranged in said channel member, and means for locking the magnetic parts and pole pieces in the channel member, said channel member having an outer surface which forms a continuous face for supporting printing plates on the cylinder.
Claim 3
Dependent Claim
19 words
The cylinder according to claim 1 wherein said holding means comprises a mechanically interlocking element in said channel member.
Claim 4
Dependent Claim
16 words
The cylinder according to claim 1, wherein each of said magnetic parts includes a permanent magnet.
Claim 5
Dependent Claim
25 words
The cylinder according to claim 1 wherein the outer side walls of said channel member extend radially outward from the surface of said plate cylinder.
Claim 6
Dependent Claim
15 words
The cylinder according to claim 1 wherein said magnetic part includes an integral permanent magnet.
Claim 7
Dependent Claim
18 words
The cylinder according to claim 1 wherein said channel member is formed from a magnetic flux insulating material.
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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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |