Patent US2999561A successfully refreshed from Google Patents.
Patent US3843035A successfully refreshed from Google Patents.
US3843035A
Expired / Lapsed
US
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Guide element for magnetic tapes
Assignee: BASF SE
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Filing: 1973-01-18
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Granted: 1974-10-22
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Expires: 1993-01-18
Abstract
Abstract Guide elements for magnetic tapes, particularly for tapes in magnetic tape cartridges, having a guide surface with a specific roughness so that adhesion between the tape base and the guide surface which preferably consists of plastics material cannot occur. Undisturbed tape travel is thus achieved in a simple manner.
Inventors
- 👤 H Fitterer
- 👤 K Scmidts
- 👤 D Gaiser
- 👤 K Uhl
- 👤 F Guenther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:59
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A tape guide element for winding tape on or off a tape pack in magnetic tape cartridges, said element being of nonmagnetizable material and having a guide surface for the back of the turn of tape approaching or leaving the tape pack, said guide surface exhibiting a surface roughness with a center line average value Ra of at least 0.28 Mu to about 3.15 Mu .
Claim 2
Dependent Claim
66 words
A tape guide element for winding tape on or off a tape pack in magnetic tape cartridges, said element being of nonmagnetizable material and having a guide surface for the back of the turn of tape approaching or leaving the tape pack, said guide surface exhibiting a surface roughness with a center line average value Ra of at least 0.28 Mu to about 3.15 Mu .
Claim 3
Dependent Claim
34 words
A tape guide element as claimed in claim 1, wherein the guide surface exhibits a surface roughness having a center line average value Ra of from about 0.85 Mu to about 3.15 Mu .
Claim 4
Dependent Claim
65 words
A tape guide element as claimed in claim 2, wherein the area of the roughened guide surface exhibiting a surface roughness having a center line average value Ra of from about 0.85 Mu to about 3.15 Mu which is in contact with the tape base is one third to one half smaller than the contact area of a smooth guide surface of the same size.
Claim 5
Dependent Claim
34 words
A tape guide element as claimed in claim 1, wherein the guide surface exhibits a surface roughness having a center line average value Ra of from about 1.6 Mu to about 3.15 Mu .
Claim 6
Dependent Claim
43 words
A tape guide element as claimed in claim 1, wherein the area of the roughened guide surface in contact with the tape base is one third to one half smaller than the contact area of a smooth guide surface of the same size.
Claim 7
Dependent Claim
15 words
A tape guide element as claimed in claim 1, wherein the guide surface is grained.
Claim 8
Dependent Claim
20 words
A tape guide element as claimed in claim 1, wherein the guide surface is provided with grooves, particularly longitudinal grooves.
Claim 9
Dependent Claim
66 words
A tape guide element for winding tape on or off a tape pack in magnetic tape cartridges, said element being of thermoplastic material and having a guide surface for the back of the turn of tape approaching or leaving the tape pack, said guide surface exhibiting a surface roughness with a center line average value Ra of at least 0.28 Mu to about 3.15 Mu .
Claim 10
Dependent Claim
66 words
A tape guide element for winding tape on or off a tape pack in magnetic tape cartridges, said element being of thermoplastic material and having a guide surface for the back of the turn of tape approaching or leaving the tape pack, said guide surface exhibiting a surface roughness with a center line average value Ra of at least 0.28 Mu to about 3.15 Mu .
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |