US3602940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording tape cleaner
Assignee: International Business Machines Corp
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Filing: 1968-12-16
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Granted: 1971-09-07
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Expires: 1988-12-16
Abstract
Abstract A magnetic recording tape cleaner comprises an element with a tape wiping surface. Tapes are cleaned by passing them over the surface which scrapes unwanted recording material particles from the tape surface. As these particles accumulate primarily at the edges of the tape, the wiping surface is curved to apply more wiping pressure to the edges of the tape than the center thereof.
Inventors
- 👤 Raymond A Barbeau
- 👤 Edward J Wroblewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:17
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/58; G02; G02B; G02B5/00; G02B5/12; G02B5/122; G02B5/124; G11B23/00; G11B23/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
An improved magnetic recording tape cleaner, comprising means defining a path for a magnetic tape, a tape-cleaning device for contacting a magnetic surface of said tape in said path, a concave surface on said device for engaging the magnetic surface of said tape to momentarily deform its magnetic surface to a corresponding concave cross section for applying a maximum wiping pressure at the edges and a minimum wiping pressure at the center of the tape, said concave surface being formed with an arcuate knife edge.
Claim 2
Dependent Claim
85 words
An improved magnetic recording tape cleaner, comprising means defining a path for a magnetic tape, a tape-cleaning device for contacting a magnetic surface of said tape in said path, a concave surface on said device for engaging the magnetic surface of said tape to momentarily deform its magnetic surface to a corresponding concave cross section for applying a maximum wiping pressure at the edges and a minimum wiping pressure at the center of the tape, said concave surface being formed with an arcuate knife edge.
Claim 3
Dependent Claim
51 words
An improved magnetic recording tape cleaner including: means defining a path for a magnetic tape, a tape-cleaning device comprising two spaced-apart arms, each arm formed with a concave knife edge extending into said path for engaging a magnetic surface of said tape to deform it with a corresponding concave cross section.
Claim 4
Dependent Claim
51 words
An improved magnetic recording tape cleaner including: means defining a path for a magnetic tape, a tape-cleaning device comprising two spaced-apart arms, each arm formed with a concave knife edge extending into said path for engaging a magnetic surface of said tape to deform it with a corresponding concave cross section.
Claim 5
Dependent Claim
73 words
An improved magnetic recording tape cleaner including means defining a path for a magnetic tape, a tape-cleaning device comprising two spaced-apart arms, each arm formed with a concave knife edge extending into said path for engaging a magnetic surface of said tape to deform it with a corresponding concave cross section means for partially evacuating the space between said arms to draw said tape into a concave form against each concave knife edge.
Claim 6
Dependent Claim
73 words
An improved magnetic recording tape cleaner including means defining a path for a magnetic tape, a tape-cleaning device comprising two spaced-apart arms, each arm formed with a concave knife edge extending into said path for engaging a magnetic surface of said tape to deform it with a corresponding concave cross section means for partially evacuating the space between said arms to draw said tape into a concave form against each concave knife edge.
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |