US4451864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic-tape cassette
Assignee: US Philips Corp
•
Filing: 1982-09-02
•
Granted: 1984-05-29
•
Expires: 2002-09-02
Abstract
Abstract A magnetic-tape cassette of the type having an opening in a side wall along which the magnetic-tape extends, for insertion of a magnetic head through the opening to scan tracks on the magnetic-tape. A pressure element in the cassette, behind the place where the tape is scanned, engages only a part of the width of the tape, including the part along which the track extends.
Inventors
- 👤 Arnold Prodinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:42
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08771; G11B15/00; G11B15/60; G11B15/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A magnetic-tape cassette for storing information in the form of a plurality of information tracks on a magnetic tape, each track extending over less than the entire width of the tape, comprising a cassette side wall having at least one aperture therethrough, two winding hubs and a length of magnetic-tape wound on said hubs and extending past said aperture, an elastic pressure element located in the cassette, a support on which said element is arranged, and means for pressing said element against the tape so that the tape is pressed resiliently against the head face of a magnetic head which has been inserted through the aperture in such a way that the head face engages the magnetic-tape over the full tape width, characterized by comprising two said pressure elements, each pressure element engaging only a part of the width of the magnetic tape, the track to be scanned extending in said part.
Claim 2
Dependent Claim
152 words
A magnetic-tape cassette for storing information in the form of a plurality of information tracks on a magnetic tape, each track extending over less than the entire width of the tape, comprising a cassette side wall having at least one aperture therethrough, two winding hubs and a length of magnetic-tape wound on said hubs and extending past said aperture, an elastic pressure element located in the cassette, a support on which said element is arranged, and means for pressing said element against the tape so that the tape is pressed resiliently against the head face of a magnetic head which has been inserted through the aperture in such a way that the head face engages the magnetic-tape over the full tape width, characterized by comprising two said pressure elements, each pressure element engaging only a part of the width of the magnetic tape, the track to be scanned extending in said part.
Claim 3
Dependent Claim
52 words
A cassette as claimed in claim 1, characterized in that the pressure element which is adapted to co-operate with the magnetic tape over only a part of its width extends at least up to that longitudinal edge of the magnetic tape which is disposed nearest the track which extends in said part.
Claim 4
Dependent Claim
86 words
A cassette as claimed in claim 2 or 1, which is reversible and which has two apertures and two pressure elements which are disposed mirror-symmetrically relative to the transverse plane of symmetry of the cassette, which plane extends perpendicularly to the side wall in which the apertures are formed, characterized in that the pressure elements which are each adapted to co-operate with only a part of the width of the magnetic tape are arranged mirror-symmetrically relative to the longitudinal plane of symmetry of the magnetic tape.
References Cited (Backward Citations)
US3932893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |