US3761333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for manufacturing of a magnetic storage disk
Assignee: International Business Machines Corp
•
Filing: 1971-05-21
•
Granted: 1973-09-25
•
Expires: 1991-05-21
Abstract
Abstract A METHOD OF MANUFACTURING A MAGNETIC STORAGE DISK ADAPTED FOR USE IN DATA PROCESSING SYSTEMS COMPRISING THE STEPS OF PROVIDING DIE MEANS HAVING TWO REMOVABLE RINGS, APPLYING A MAGNETIZABLE MATERIAL ON ONE SIDE OF EACH RING TO FORM A MAGNETIZABLE LAYER THEREON, INTRODUCING A CARRIER CORE INTO THE DIE MEANS AND BETWEEN SAID MAGNETIZABLE LAYER TO BE TESTED PRIOR TO BEING ALLOWS THE MAGNETIZABLE LAYER TO BE TESTED PRIOR TO BEING BONDED TO THE CARRIER CORE.
Inventors
- 👤 E Kleinbeck
- 👤 H Pilgram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:01
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |