US3192608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple ferrite heads with workable metal screens
Assignee: US Philips Corp
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Filing: 1961-06-26
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Granted: 1965-07-06
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Expires: 1981-06-26
Abstract
No abstract record available.
Inventors
- 👤 Rinia Herre
- 👤 Hendrik Johannes Meerka Embden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
METHOD OF MANUFACTURING A MULTIPLE MAGNETIC HEAD INCLUDING A PLURALITY OF INDIVIDUAL MAGNETIC HEADS COMPOSED OF FERRITE, EACH INDIVIDUAL HEAD HAVING A BEARING SURFACE ADAPTED TO BE PLACED ADJACENT A MOVING MAGNETIC CARRIER, COMPRISING: PLACING A PLATE CONSISTING OF METALLIC NON-MAGNETIC MATERIAL BETWEEN EACH PAIR OF FERRITE HEADS, EACH PLATE HAVING A BEARING SURFACE EXTENDING SUBSTANTIALLY FLUSH WITH THE BEARING SURFACES OF THE MAGNETIC HEADS, SAID NON-MAGNETIC MATERIAL HAVING AN IMPACT STRENGTH LYING BETWEEN 0.5 AND 10 KG./CM., A BEND ING STRENGTH LYING BETWEEN 10 AND 45KG./MM.2, AND A HARDNESS LYING BETWEEN 425 AND 480 V10, AND SIMULTANEOUSLY MACHINING THE BEARING SURFACES OF THE MAGNETIC HEADS AND THE PLATES WHEREBY A MULTIPLE MAGNETIC HEAD IS PRODUCED HAVING A SUBSTANTIALLY SMOOTH SURFACE ADAPTED TO CO-ACT WITH SAID MOVING MAGNETIC CARRIER.
Claim 2
Dependent Claim
129 words
METHOD OF MANUFACTURING A MULTIPLE MAGNETIC HEAD INCLUDING A PLURALITY OF INDIVIDUAL MAGNETIC HEADS COMPOSED OF FERRITE, EACH INDIVIDUAL HEAD HAVING A BEARING SURFACE ADAPTED TO BE PLACED ADJACENT A MOVING MAGNETIC CARRIER, COMPRISING: PLACING A PLATE CONSISTING OF METALLIC NON-MAGNETIC MATERIAL BETWEEN EACH PAIR OF FERRITE HEADS, EACH PLATE HAVING A BEARING SURFACE EXTENDING SUBSTANTIALLY FLUSH WITH THE BEARING SURFACES OF THE MAGNETIC HEADS, SAID NON-MAGNETIC MATERIAL HAVING AN IMPACT STRENGTH LYING BETWEEN 0.5 AND 10 KG./CM., A BEND ING STRENGTH LYING BETWEEN 10 AND 45KG./MM.2, AND A HARDNESS LYING BETWEEN 425 AND 480 V10, AND SIMULTANEOUSLY MACHINING THE BEARING SURFACES OF THE MAGNETIC HEADS AND THE PLATES WHEREBY A MULTIPLE MAGNETIC HEAD IS PRODUCED HAVING A SUBSTANTIALLY SMOOTH SURFACE ADAPTED TO CO-ACT WITH SAID MOVING MAGNETIC CARRIER.
References Cited (Backward Citations)
US2921143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |