US4385734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring with rib for winding magnetic tape
Assignee: TDK Corp
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Filing: 1981-01-13
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Granted: 1983-05-31
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Expires: 2001-01-13
Abstract
Abstract A ribbed ring for winding a magnetic tape cut in narrow width is disclosed which has an annular outer peripheral part and a groove for reinforcing the ring against deformation and a rib for fitting to a groove of an adjacent ring and an annular inner peripheral part having one or more slits for fitting to a spline shaft.
Inventors
- 👤 Haruo Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:38
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/037
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
An annular ring for receivably winding narrow magnetic tape, the improvement comprising: a reinforcing annular groove formed on one side of said ring and concentric therewith; a rib formed on the opposite side of said ring whereby said rib is formed to receive a groove of an adjacent annular ring; at least one slit formed on the inner surface of said ring for receiving a spline shaft; a plurality of reinforcing projections formed on said inner surface of said ring; a plurality of recesses formed on said inner surface of said ring and a corresponding plurality of rectangular concaves are each formed around each of said recesses so that said recesses and concaves are formed to receive one of a reinforcing projection on an adjacent ring.
Claim 2
Dependent Claim
126 words
An annular ring for receivably winding narrow magnetic tape, the improvement comprising: a reinforcing annular groove formed on one side of said ring and concentric therewith; a rib formed on the opposite side of said ring whereby said rib is formed to receive a groove of an adjacent annular ring; at least one slit formed on the inner surface of said ring for receiving a spline shaft; a plurality of reinforcing projections formed on said inner surface of said ring; a plurality of recesses formed on said inner surface of said ring and a corresponding plurality of rectangular concaves are each formed around each of said recesses so that said recesses and concaves are formed to receive one of a reinforcing projection on an adjacent ring.
Claim 3
Dependent Claim
21 words
The ring according to claim 1 wherein each of said reinforcing projections are formed around a corresponding one of said slits.
Claim 4
Dependent Claim
20 words
The ring according to claim 1 or 2 wherein said groove and said rib are formed as concavo-convex surfaces, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |