US3851115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained low crossfeed tape cassette assembly
Assignee: HAMILTON DIGITAL CONTROLS Inc
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Filing: 1971-10-04
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Granted: 1974-11-26
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Expires: 1991-10-04
Abstract
Abstract A magnetic tape cassette in which crossfeed is minimized includes a case housing tape reels and guides leading the tape across the magnetic head access opening in the case front wall. A leaf spring supported behind the opening carries a pressure pad resiliently bearing on the tape and including a backing plate of high magnetic permeability having a soft resilient pad on its front face or a soft resilient pad having a dispersed particulate high permeability material.
Inventors
- 👤 E Zacaroli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:06
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08792
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A magnetic tape cassette comprising a case having an aperture in a peripheral wall thereof for exposing tape for engagement by a magnetic transducer head, a tape carrying reel disposed in said case, guide means for leading magnetic tape from said reel along a path registering with said aperture with the front face of said tape directed outwardly through said aperture, a pressure pad of high magnetic permeability supported in said case and bearing on the rear face of said tape in registry with said aperture and resilient means engaging said pressure pad for urging said pad toward said tape and said tape toward said transducer head.
Claim 2
Dependent Claim
107 words
A magnetic tape cassette comprising a case having an aperture in a peripheral wall thereof for exposing tape for engagement by a magnetic transducer head, a tape carrying reel disposed in said case, guide means for leading magnetic tape from said reel along a path registering with said aperture with the front face of said tape directed outwardly through said aperture, a pressure pad of high magnetic permeability supported in said case and bearing on the rear face of said tape in registry with said aperture and resilient means engaging said pressure pad for urging said pad toward said tape and said tape toward said transducer head.
Claim 3
Dependent Claim
26 words
The magnetic tape cassette of claim 1 wherein said pressure pad includes a material selected from the class consisting of mu metal and magnetic ferrite materials.
Claim 4
Dependent Claim
44 words
The magnetic tape cassette of claim 1 wherein said pressure pad comprises a rear member formed of a magnetic material having a high magnetic permeability and a front member of soft resilient material overlying the front face of and secured to said rear member.
Claim 5
Dependent Claim
27 words
The magnetic tape cassette of claim 1 wherein said resilient means comprises a spring member positioned in said case behind said aperture and supporting said pressure pad.
Claim 6
Dependent Claim
26 words
The magnetic tape cassette of claim 1 wherein said resilient means comprises a longitudinally extending leaf spring located behind said aperture and supporting said pressure pad.
Claim 7
Dependent Claim
66 words
The magnetic tape cassette of claim 1 wherein said case includes top and bottom walls and including a pair of spring mount elements located between said top and bottom walls and behind and proximate opposite sides of said aperture, and said resilient means comprises a leaf spring extending between and engaging said mount, said pressure pad being positioned on the front face of said leaf spring.
Claim 8
Dependent Claim
109 words
A magnetic tape cassette comprising a case having an aperture in a peripheral wall thereof for exposing tape for engagement by a magnetic transducer head, a tape carrying reel disposed in said case, guide means for leading magnetic tape from said reel along a path registering with said aperture with the front face of said tape directed outwardly through said aperture and a pressure pad of high magnetic permeability including a front section of soft resilient material having dispersed therein a material of high magnetic permeability in a finely divided state supported in said case and bearing on the rear face of said tape in registry with said aperture.
Claim 9
Dependent Claim
109 words
A magnetic tape cassette comprising a case having an aperture in a peripheral wall thereof for exposing tape for engagement by a magnetic transducer head, a tape carrying reel disposed in said case, guide means for leading magnetic tape from said reel along a path registering with said aperture with the front face of said tape directed outwardly through said aperture and a pressure pad of high magnetic permeability including a front section of soft resilient material having dispersed therein a material of high magnetic permeability in a finely divided state supported in said case and bearing on the rear face of said tape in registry with said aperture.
References Cited (Backward Citations)
US2981805A
Cited
US3495787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |