US4821133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottleneck magnetoresistive element
Assignee: Seagate Technology LLC
•
Filing: 1988-02-05
•
Granted: 1989-04-11
•
Expires: 2008-02-05
Abstract
Abstract A magnetoresistive sensor element having bottleneck shaped ends. The sensor element has a highly stable, single domain central region, which eliminates Barkhausen noise.
Inventors
- 👤 Greogory S. Mowry
- 👤 Terry B. Mitchell
- 👤 Charles H. Tolman
- 👤 Peter K. George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:08
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/398; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A bottleneck magnetoresistive sensor element having a central wide portion with opposed substantially parallel sides and two ends, a narrowing transition portion connected to each end with at least one inclined side, and a bottleneck portion connected to each transition portion, the bottleneck portion having a width less than the central wide portion and being rectangular in shape with the sides of the rectangle's long dimension being substantially parallel with the sides of said central region.
Claim 2
Dependent Claim
76 words
A bottleneck magnetoresistive sensor element having a central wide portion with opposed substantially parallel sides and two ends, a narrowing transition portion connected to each end with at least one inclined side, and a bottleneck portion connected to each transition portion, the bottleneck portion having a width less than the central wide portion and being rectangular in shape with the sides of the rectangle's long dimension being substantially parallel with the sides of said central region.
Claim 3
Dependent Claim
24 words
The magnetoresistive element of claim 1 wherein the shape is symmetrical about a centerline substantially parallel with the ends of said central wide portion.
Claim 4
Dependent Claim
29 words
The magnetoresistive element of claim 1 wherein the easy axis of the element is oriented in a direction parallel to the opposed parallel sides of the central wide portion.
Claim 5
Dependent Claim
30 words
The magnetoresistive element of claim 1 wherein the easy axis of the element is oriented in a direction skewed relative to the opposed parallel sides of the central wide portion.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |