Patent US6270528B1 successfully refreshed from Google Patents.
US3055770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin magnetic films
Assignee: International Business Machines Corp
•
Filing: 1960-12-23
•
Granted: 1962-09-25
•
Expires: 1980-12-23
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Sankuer
- 👤 Riseman Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/26; H01F10/28; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31714
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
AS AN ARTICLE OF MANUFACTURE, A MAGNETIC DEVICE OF THE RECTANGULARA HYSTERESIS LOOP TYPE AND HAVING IMPROVED MAGNETIC PROPERTIES COMPRISING IN COMBINATION, A SUPPORTING SUBSTRATE, A RESINOUS UNDERCOATING SUPPORTED ON THE SUBSTRATE, SAID UNDDERCOATING INCLUDING THEREIN A MULTIPLICITY OF DISCRETE PAARTICLES OF GRANULAR MATERIAL SOME OF WHICH PROJECT ABOVE THE SURFACE OF THE COATING AND CREATE A SURFACES HAVING UNIFORM AND CONTROLLED SURFACE IRREGULARITIES, SAID GRANULAR MATERIAL HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN ABOUT 50 MICRONS AND A CONCENTRATION OF LESS THAN ABOUT 40 PERCENT BY WEIGHT OF THE TOTAL SOLIDS CONTENT OF THE UNDERCOATING, AND A CONTINUOUS THIN MAGNETIC METALLIC FILM HAVING A THICKNESS OF BETWEEN ABOUT 10,000 AND 240,000 ANGSTROMS SUPPORTED UPON SAID UNDERCOATING.
Claim 2
Dependent Claim
118 words
AS AN ARTICLE OF MANUFACTURE, A MAGNETIC DEVICE OF THE RECTANGULARA HYSTERESIS LOOP TYPE AND HAVING IMPROVED MAGNETIC PROPERTIES COMPRISING IN COMBINATION, A SUPPORTING SUBSTRATE, A RESINOUS UNDERCOATING SUPPORTED ON THE SUBSTRATE, SAID UNDDERCOATING INCLUDING THEREIN A MULTIPLICITY OF DISCRETE PAARTICLES OF GRANULAR MATERIAL SOME OF WHICH PROJECT ABOVE THE SURFACE OF THE COATING AND CREATE A SURFACES HAVING UNIFORM AND CONTROLLED SURFACE IRREGULARITIES, SAID GRANULAR MATERIAL HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN ABOUT 50 MICRONS AND A CONCENTRATION OF LESS THAN ABOUT 40 PERCENT BY WEIGHT OF THE TOTAL SOLIDS CONTENT OF THE UNDERCOATING, AND A CONTINUOUS THIN MAGNETIC METALLIC FILM HAVING A THICKNESS OF BETWEEN ABOUT 10,000 AND 240,000 ANGSTROMS SUPPORTED UPON SAID UNDERCOATING.
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |