Patent US3330033A successfully refreshed from Google Patents.
US3330033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of supports for magnetic heads
Assignee: US Philips Corp
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Filing: 1964-12-31
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Granted: 1967-07-11
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Expires: 1984-12-31
Abstract
No abstract record available.
Inventors
- 👤 Manders Godefridus Johannes
- 👤 Antonius Hubertus Victor Lijf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/133; G11B5/1335; G11B5/48; G11B5/52; G11B5/53; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011; Y10T29/4902; Y10T29/49021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A METHOD OF MANUFACTURING A CYLINDRICAL SUPPORT ADAPTED TO ROTATE IN OPERATION AND PROVIDED AT ITS PERIPHERY WITH A PLURALITY OF MAGNETIC HEADS EACH HAVING AN EFFECTIVE GAP, COMPRISING: ARRANGING A PLURALITY OF CIRCULAR FLAT DISKS COMPOSED OF SINTERED OXIDIC FERROMAGNETIC MATERIAL AND HAVING SUBSTANTIALLY THE SAME DIAMETERS IN A MANNER SUCH THAT THE RIMS OF ADJACENT DISKS ABUT EACH OTHER, THE CENTERS OF ONE GROUP OF SAID PLURALITY OF DISKS LYING A CIRCLE WHOSE CENTER LIES IN THE AXIS OF ROTATION OF THE SUPPORT, PLACING A NONMAGNETIC BONDING AGENT BETWEEN THE DISKS, THUS FORMING A COMPOSITE BONDED, ASSEMBLY, SAID BONDING AGENT HAVING SUBSTANTIALLY THE SAME MACHINABILITY AND RESISTANCE TO WEAR AS SAID FERROMAGNETIC MATERIAL, AND MACHINING SAID COMPOSITE ASSEMBLY TO REDUCE THE DIAMETER THEREOF TO A VALUE SUCH THAT AT LEAST THE LINES OF CONTACT BETWEEN EACH TWO ADJACENT DISKS WHICH EXTEND PARALLEL TO THE AXIS OF ROTATION ARE REMOVED, SAID MACHINING BEING CONTINUED UNTIL THE GAPS FILLED WITH THE BONDING AGENT AND HAVING A PREDETERMINED LENGTH ARE PRODUCED BETWEEN ADJACENT DISKS OF SAID ONE GROUP.
Claim 2
Independent Claim
177 words
A METHOD OF MANUFACTURING A CYLINDRICAL SUPPORT ADAPTED TO ROTATE IN OPERATION AND PROVIDED AT ITS PERIPHERY WITH A PLURALITY OF MAGNETIC HEADS EACH HAVING AN EFFECTIVE GAP, COMPRISING: ARRANGING A PLURALITY OF CIRCULAR FLAT DISKS COMPOSED OF SINTERED OXIDIC FERROMAGNETIC MATERIAL AND HAVING SUBSTANTIALLY THE SAME DIAMETERS IN A MANNER SUCH THAT THE RIMS OF ADJACENT DISKS ABUT EACH OTHER, THE CENTERS OF ONE GROUP OF SAID PLURALITY OF DISKS LYING A CIRCLE WHOSE CENTER LIES IN THE AXIS OF ROTATION OF THE SUPPORT, PLACING A NONMAGNETIC BONDING AGENT BETWEEN THE DISKS, THUS FORMING A COMPOSITE BONDED, ASSEMBLY, SAID BONDING AGENT HAVING SUBSTANTIALLY THE SAME MACHINABILITY AND RESISTANCE TO WEAR AS SAID FERROMAGNETIC MATERIAL, AND MACHINING SAID COMPOSITE ASSEMBLY TO REDUCE THE DIAMETER THEREOF TO A VALUE SUCH THAT AT LEAST THE LINES OF CONTACT BETWEEN EACH TWO ADJACENT DISKS WHICH EXTEND PARALLEL TO THE AXIS OF ROTATION ARE REMOVED, SAID MACHINING BEING CONTINUED UNTIL THE GAPS FILLED WITH THE BONDING AGENT AND HAVING A PREDETERMINED LENGTH ARE PRODUCED BETWEEN ADJACENT DISKS OF SAID ONE GROUP.
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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |