US3214746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic delay head
Assignee: Bunker Ramo Corp
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Filing: 1961-06-07
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Granted: 1965-10-26
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Expires: 1981-06-07
Abstract
No abstract record available.
Inventors
- 👤 Harold J Mccreary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:48
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B5/00; G11B5/127; G11B5/187; G11B5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A MAGNETIC HEAD CAPABLE OF SIMULTANEOUSLY READING AND WRITING COMPRISING: A READ PORTION AND A WRITE PORTION, SAID READ PORTION COMPRISING A FIRST BAR AND A FIRST YOKE MEMBER IN MAGNETIC ASSOCIATION WITH EACH OTHER ACROSS FIRST UPPER AND LOWER GAPS, SAID FIRST BAR AND FIRST YOKE BEING PROVIDED WITH SPACED OPPOSED NONPARALLEL SURFACES CONVERGING TOWARD THE EXTREMITIES THEREOF TO DEFINE A SUBSTANTIALLY WEDGE SHAPED LOWER GAP, A LAYER OF ELECTRICALLY OPENED CONDUCTIVE MATERIAL DISPOSED AROUND AT LEAST ONE OF SAID FIRST BAR AND FIRST YOKE MEMBER, A WINDING WOUND ON SAID FIRST YOKE MEMBER, SAID WRITE PORTION COMPRISING A SECOND BAR AND A SECOND YOKE MEMBER IN MAGNETIC ASSOCIATION WITH EACH OTHER ACROSS SECOND UPPER AND LOWER GAPS, SAID SECOND BAR AND SECOND YOKE BEING PROVIDED WITH SPACED OPPOSED NONPARALLEL SURFACES CONVERGING TOWARD THE EXTREMITIES THEREOF TO DEFINE A SUBSTANTIALLY WEDGE SHAPED LOWER GAP, A LAYER OF ELECTRICALLY OPENED CONDUCTIVE MATERIAL DISPOSED AROUND AT LEAST ONE OF SAID SECOND BAR AND SECOND YOKE MEMBER, AND A WINDING WOUND ON SAID SECOND YOKE MEMBER.
Claim 2
Dependent Claim
174 words
A MAGNETIC HEAD CAPABLE OF SIMULTANEOUSLY READING AND WRITING COMPRISING: A READ PORTION AND A WRITE PORTION, SAID READ PORTION COMPRISING A FIRST BAR AND A FIRST YOKE MEMBER IN MAGNETIC ASSOCIATION WITH EACH OTHER ACROSS FIRST UPPER AND LOWER GAPS, SAID FIRST BAR AND FIRST YOKE BEING PROVIDED WITH SPACED OPPOSED NONPARALLEL SURFACES CONVERGING TOWARD THE EXTREMITIES THEREOF TO DEFINE A SUBSTANTIALLY WEDGE SHAPED LOWER GAP, A LAYER OF ELECTRICALLY OPENED CONDUCTIVE MATERIAL DISPOSED AROUND AT LEAST ONE OF SAID FIRST BAR AND FIRST YOKE MEMBER, A WINDING WOUND ON SAID FIRST YOKE MEMBER, SAID WRITE PORTION COMPRISING A SECOND BAR AND A SECOND YOKE MEMBER IN MAGNETIC ASSOCIATION WITH EACH OTHER ACROSS SECOND UPPER AND LOWER GAPS, SAID SECOND BAR AND SECOND YOKE BEING PROVIDED WITH SPACED OPPOSED NONPARALLEL SURFACES CONVERGING TOWARD THE EXTREMITIES THEREOF TO DEFINE A SUBSTANTIALLY WEDGE SHAPED LOWER GAP, A LAYER OF ELECTRICALLY OPENED CONDUCTIVE MATERIAL DISPOSED AROUND AT LEAST ONE OF SAID SECOND BAR AND SECOND YOKE MEMBER, AND A WINDING WOUND ON SAID SECOND YOKE MEMBER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |