US3612774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Snap-on erasing member for compact cassette recorder
Assignee: Individual
•
Filing: 1969-02-03
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Granted: 1971-10-12
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Expires: 1989-02-03
Abstract
Abstract The combination with a compact cassette-type tape recorder of a snap-on readily removable permanent magnet erasing member which fits between the removable cartridge and the inside wall of the cassette cavity of the recorder for erasing the magnetic tape when the tape is rewound. The erasing member has two longitudinally spaced, transversely disposed magnets on a flat carrier and longitudinally and transversely spaced detents for projecting through windows in the cassette so that the erase member may be snapped onto the cassette.
Inventors
- 👤 Edgard R Wiklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
The combination with a cassette recorder having a plurality of windows in the front wall of the cassette adjacent which the magnetic recording tape passes, of an erasing member comprising a permanent magnet of smaller dimensions than one of said windows, said magnet projecting into the cassette through said window and contacting the tape, a carrier for said magnet and detent members on said carrier, said detent members projecting through said window and yieldably engaging a wall thereof for holding the carrier in place on the front wall of the cassette said carrier being a thin flat plastic plate and said detent members being formed integrally with said plate and projecting laterally from it, said detent members having camming surfaces at their outer ends, which surfaces engage a wall of the window.
Claim 2
Dependent Claim
132 words
The combination with a cassette recorder having a plurality of windows in the front wall of the cassette adjacent which the magnetic recording tape passes, of an erasing member comprising a permanent magnet of smaller dimensions than one of said windows, said magnet projecting into the cassette through said window and contacting the tape, a carrier for said magnet and detent members on said carrier, said detent members projecting through said window and yieldably engaging a wall thereof for holding the carrier in place on the front wall of the cassette said carrier being a thin flat plastic plate and said detent members being formed integrally with said plate and projecting laterally from it, said detent members having camming surfaces at their outer ends, which surfaces engage a wall of the window.
Claim 3
Dependent Claim
42 words
The combination of claim 1 wherein the detent members comprise two spaced fingers located at one side of the magnet, one finger being located above the tape and the other below it so that the fingers prevent dislocation of the tape laterally.
Claim 4
Dependent Claim
32 words
The combination of claim 1 wherein said carrier is formed to provide an integral C-shaped shield member enclosing three sides of said magnet to protect it against being broken from the carrier.
Claim 5
Dependent Claim
68 words
The combination of claim 1 wherein said magnet is located at one end of the carrier and a second magnet is located at the opposite end of said carrier, and wherein the cassette is provided with two spaced windows, each magnet projecting through one window, and wherein spaced detents are provided adjacent said second magnet, said detents engaging a wall of the window through which that magnet projects.
Claim 6
Dependent Claim
50 words
The combination of claim 4 wherein said carrier is a thin flat plate and the detent members are formed integrally with said plate and project laterally from it and wherein said detent members have camming surfaces at their outer ends engaging a wall of the window through which they project.
Claim 7
Dependent Claim
24 words
The combination of claim 5 wherein the carrier is formed to provide integral C-shaped shield members one member enclosing three sides of each magnet.
Claim 8
Dependent Claim
46 words
The combination of claim 6 wherein the north pole of one magnet and the south pole of the other lie adjacent the same edge of the tape so that the magnetism of the tape will be driven first in one direction and then in the other.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |