US3283396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer assembly and manufacture
Assignee: Ampex Corp
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Filing: 1964-05-12
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Granted: 1966-11-08
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Expires: 1984-05-12
Abstract
No abstract record available.
Inventors
- 👤 Robert F Pfost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:13
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055; Y10T29/49057; Y10T29/49073; Y10T29/49075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD OF FORMING MAGNETIC TRANSDUCER ASSEMBLIES COMPRISING THE STEPS OF: DEPOSITING SPACER STRIPS OF MATERIAL HAVING A RELATIVELY HIGH MELTING POINT LONGITUDINALLY ON A SURFACE OF A LAPPED AND POLISHED FERRITE SLAB HAVING A PREDETERMINED CONFIGURATION; DEPOSITING A THIN LAYER OF GLASS ON A CORRESPONDING SURFACE OF ANOTHER POL ISHED FERRITE SLAB, SAID SLABS HAVING SUBSTANTIALLY THE SAME CONFIGURATION AND PHYSICAL CHARACTERISTICS; CUTTING THE SLABS IN A DIRECTION TRANSVERSE TO THE LONGITUDINAL STRIPS OF SPACER MATERIAL TO FORM BLOCKS HAVING DESIRED DIMENSIONS; JOINING EACH OF THE BLOCKS CONTAINING SPACE MATERIAL WITH EACH OF THE GLASS COATED BLOCKS IN AN ATMOSPHERE HAVING A TEMPERATURE OF ABOUT 550-900* CENTRIGRADE UNDER HIGH PRESSURE TO FORM A NONMAGNETIC GAP LAYER BETWEEN SAID FORMED BLOCKS; CUTTING THE JOINED ASSEMBLY ALONG THE LONGITUDINAL STRIPS OF SPACER MATERIAL PERPENDICULAR TO THE JOINED SURFACES TO REMOVE SAID SPACER MATERIAL AND PROVIDE TRANSDUCER SIZE UNITS AND DEFINE SIDES OF SAID UNITS; FORMING AN APERTURE ALONG A PORTION OF THE GAP LAYER IN EACH OF SAID TRANSDUCER UNITS TO DEFINE FRONT AND REAR GAPS; AND WINDING AN ELECTRICAL COIL THROUGH SAID APERTURE.
Claim 2
Independent Claim
183 words
THE METHOD OF FORMING MAGNETIC TRANSDUCER ASSEMBLIES COMPRISING THE STEPS OF: DEPOSITING SPACER STRIPS OF MATERIAL HAVING A RELATIVELY HIGH MELTING POINT LONGITUDINALLY ON A SURFACE OF A LAPPED AND POLISHED FERRITE SLAB HAVING A PREDETERMINED CONFIGURATION; DEPOSITING A THIN LAYER OF GLASS ON A CORRESPONDING SURFACE OF ANOTHER POL ISHED FERRITE SLAB, SAID SLABS HAVING SUBSTANTIALLY THE SAME CONFIGURATION AND PHYSICAL CHARACTERISTICS; CUTTING THE SLABS IN A DIRECTION TRANSVERSE TO THE LONGITUDINAL STRIPS OF SPACER MATERIAL TO FORM BLOCKS HAVING DESIRED DIMENSIONS; JOINING EACH OF THE BLOCKS CONTAINING SPACE MATERIAL WITH EACH OF THE GLASS COATED BLOCKS IN AN ATMOSPHERE HAVING A TEMPERATURE OF ABOUT 550-900* CENTRIGRADE UNDER HIGH PRESSURE TO FORM A NONMAGNETIC GAP LAYER BETWEEN SAID FORMED BLOCKS; CUTTING THE JOINED ASSEMBLY ALONG THE LONGITUDINAL STRIPS OF SPACER MATERIAL PERPENDICULAR TO THE JOINED SURFACES TO REMOVE SAID SPACER MATERIAL AND PROVIDE TRANSDUCER SIZE UNITS AND DEFINE SIDES OF SAID UNITS; FORMING AN APERTURE ALONG A PORTION OF THE GAP LAYER IN EACH OF SAID TRANSDUCER UNITS TO DEFINE FRONT AND REAR GAPS; AND WINDING AN ELECTRICAL COIL THROUGH SAID APERTURE.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |