US5396369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Degausser for magnetic stripe card transducing system
Assignee: MagTek Inc
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Filing: 1993-08-24
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Granted: 1995-03-07
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Expires: 2013-08-24
Abstract
Abstract A device for degaussing magnetic transducers used with magnetic stripe cards includes a degaussing unit that drives a magnetic transducer with an electrical pulse, or a gradually increasing drive frequency, to eliminate the residual magnetism of the transducer. Logic circuitry controls the device to degauss with little or no additional equipment and avoids damage to the recordings, as on low-coercivity magnetic stripe cards.
Inventors
- 👤 Robert S. DeLand, Jr.
- 👤 Richard P. Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:12
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/02; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G06K7/084; G11B5/00; G11B5/465
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A degausser for diminishing residual magnetism on a magnetic transducer for processing a magnetic stripe of a card, including a write operation leaving a residual polarity on said magnetic transducer corresponding to a polarity of a recorded signal, said degausser comprising: means for sensing a conclusion of said write operation on said magnetic stripe of said card, said means for sensing comprising a means for sensing a position of said magnetic transducer relative to said card and providing a signal indicative of said position; and means responsive to said said signal indicative of said position and said polarity of said recorded signal, for applying to said magnetic transducer, a pulse opposite in polarity to said residual polarity, for a predetermined duration of time.
Claim 2
Dependent Claim
123 words
A degausser for diminishing residual magnetism on a magnetic transducer for processing a magnetic stripe of a card, including a write operation leaving a residual polarity on said magnetic transducer corresponding to a polarity of a recorded signal, said degausser comprising: means for sensing a conclusion of said write operation on said magnetic stripe of said card, said means for sensing comprising a means for sensing a position of said magnetic transducer relative to said card and providing a signal indicative of said position; and means responsive to said said signal indicative of said position and said polarity of said recorded signal, for applying to said magnetic transducer, a pulse opposite in polarity to said residual polarity, for a predetermined duration of time.
Claim 3
Dependent Claim
79 words
A degausser for diminishing residual magnetism on a magnetic transducer for processing a magnetic stripe of a card, wherein said magnetic transducer has a predetermined frequency response, said degausser comprising: means for sensing conclusion of a write operation; and means responsive to said sensing means, for applying to said magnetic transducer, a sweep signal having a range in frequency which begins at a normal data interval, and attains a frequency that exceeds said frequency response of said magnetic transducer.
Claim 4
Dependent Claim
79 words
A degausser for diminishing residual magnetism on a magnetic transducer for processing a magnetic stripe of a card, wherein said magnetic transducer has a predetermined frequency response, said degausser comprising: means for sensing conclusion of a write operation; and means responsive to said sensing means, for applying to said magnetic transducer, a sweep signal having a range in frequency which begins at a normal data interval, and attains a frequency that exceeds said frequency response of said magnetic transducer.
Claim 5
Dependent Claim
24 words
A degausser as provided in claim 2 wherein said means for applying a sweep signal include a sweep generator for providing said sweep signal.
Claim 6
Dependent Claim
73 words
A magnetic card processing system for transducing a magnetic stripe of a magnetic card, said system comprising: a transducer for communicating a signal having a polarity with said magnetic stripe; means for moving said transducer relative to said magnetic stripe to accomplish transducing operations, including recording said magnetic stripe; and degaussing means responsive to said polarity of said communicated signal for diminishing residual magnetism of said transducer subsequent to recording said magnetic stripe.
Claim 7
Dependent Claim
73 words
A magnetic card processing system for transducing a magnetic stripe of a magnetic card, said system comprising: a transducer for communicating a signal having a polarity with said magnetic stripe; means for moving said transducer relative to said magnetic stripe to accomplish transducing operations, including recording said magnetic stripe; and degaussing means responsive to said polarity of said communicated signal for diminishing residual magnetism of said transducer subsequent to recording said magnetic stripe.
Claim 8
Dependent Claim
33 words
A magnetic card transducing system as provided in claim 4, wherein said degaussing means apply a pulse opposite in polarity to a residual polarity on said transducer, for a predetermined duration of time.
Claim 9
Dependent Claim
41 words
A magnetic card transducing system as provided in claim 5, wherein said degaussing means apply a sweep signal having a range in frequency which begins at a normal data interval, and attains a frequency that exceeds frequency response of said transducer.
Claim 10
Dependent Claim
28 words
A magnetic card transducing system as provided in claim 4, wherein said degaussing means include means for sensing completion of moving said transducer relative to said magnetic stripe.
Claim 11
Dependent Claim
26 words
A magnetic card transducing system as provided in claim 2, further including processing means coupled to said transducer to accomplish the processing of said magnetic card.
References Cited (Backward Citations)
US3471862A
Cited
US4471403A
Cited
US4651235A
Cited
US4787002A
Cited
US4956728A
Cited
US4970621A
Cited
US5220476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |