Patent US3486220A successfully refreshed from Google Patents.
US3486220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing magnetic transducers
Assignee: International Business Machines Corp
•
Filing: 1967-11-28
•
Granted: 1969-12-30
•
Expires: 1987-11-28
Abstract
No abstract record available.
Inventors
- 👤 Richard E Braun
- 👤 Hui-Li Tiao
- 👤 Ambrose A Verdibello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; G11B5/147; G11B5/1475; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048; Y10T29/49055; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3129504A
Cited
US3384954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |