Patent US1779767A successfully refreshed from Google Patents.
Patent US3660727A successfully refreshed from Google Patents.
US3660727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulk eraser with permanent magnet flux produced obliquely to cassette movement
Assignee: Sony Corp
•
Filing: 1969-10-09
•
Granted: 1972-05-02
•
Expires: 1989-10-09
Abstract
Abstract A bulk eraser for a recorded magnetic medium, the eraser consisting of a housing having a passage for the recorded magnetic medium and magnet means arranged adjacent said passage.
Inventors
- 👤 Shigemasa Ohira
- 👤 Hisoshi Hanzawa
- 👤 Hisaya Narita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/024; G11B5/0245
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A bulk eraser for a tape cassette comprising a case, two reels, and tape wound thereon, said eraser comprising: A. A housing having juxtaposed walls defining a passage through which a tape cassette can be passed; B. Permanent magnet means on said walls facing said passage and having poles producing magnetic flux obliquely to the direction of movement of the tape cassette through passage; C. A cover pivotally mounted on said housing at one end of said passage and normally biased into position to close said passage; and D. Guide means comprising a flat portion to receive said tape cassette, said guide portion being pivotally mounted on said housing to keep the other end of said passage normally closed, said flat portion guiding said tape cassette into said passage when said guide means is pivoted outwardly.
Claim 2
Dependent Claim
136 words
A bulk eraser for a tape cassette comprising a case, two reels, and tape wound thereon, said eraser comprising: A. A housing having juxtaposed walls defining a passage through which a tape cassette can be passed; B. Permanent magnet means on said walls facing said passage and having poles producing magnetic flux obliquely to the direction of movement of the tape cassette through passage; C. A cover pivotally mounted on said housing at one end of said passage and normally biased into position to close said passage; and D. Guide means comprising a flat portion to receive said tape cassette, said guide portion being pivotally mounted on said housing to keep the other end of said passage normally closed, said flat portion guiding said tape cassette into said passage when said guide means is pivoted outwardly.
Claim 3
Dependent Claim
26 words
A bulk eraser as claimed in claim 1 comprising means engaging said cassette for preventing, erasure of information intended to be permanently recorded on the tape.
Claim 4
Dependent Claim
37 words
A bulk eraser as claimed in claim 1 wherein the guide means includes means for detecting the means for preventing faulty erasure and means for preventing the movement of the tape in cooperation with the detecting means.
Claim 5
Dependent Claim
23 words
A bulk eraser as claimed in claim 1 which includes means for locking the reels in said cassette with the tape wound thereon.
Claim 6
Dependent Claim
20 words
A bulk eraser as claimed in claim 1 which has covers for closing the other open end of the passage.
Claim 7
Dependent Claim
42 words
A bulk eraser as claimed in claim 5 wherein the covers include means which permits the opening of the covers from the inside by the magnetic medium having passed the passage but prevents the insertion of the magnetic medium from the outside.
Claim 8
Dependent Claim
25 words
A bulk eraser as claimed in claim 5 wherein the covers are attracted by the magnetic force of the magnet means to close the passage.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |