US2641556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sheet material provided
Assignee: —
•
Filing: —
•
Granted: 1953-06-09
•
Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
C; C23; C23C; C23C28/00; B; B32; B32B; B32B15/00; B32B15/14; C21; C21D; C21D8/00; C21D8/12; C21D8/1277; C21D8/1283; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD WHICH COMPRISES PROVIDING MAGNETIC SHEET MATERIAL WITH A COATING COMPOSED OF A SUSPENSION OF A FINELY DIVIDED REFRACTORY SEPARATOR MATERIAL IN WATER CONTAINING FROM ABOUT 0.3 TO 2, BY WEIGHT OF METHYL CELLULOSE, DRYING THE COATING, AT SUCH A TEMPERATURE AND SUCH A RATE THAT THE FILM FORMING PROPERTIES OF THE METHYL CELLULOSE ARE NOT DESTROYED, MECHANICALLY PROCESSING THE COATED MATERIAL TO PLACE IT IN THE PHYSICAL CONDITION DESIRED PRIOR TO THE FINAL ANNEAL THEREOF TO DEVELOP ITS OPTIMUM MAGNETIC PROPERTIES, AND BOX ANNEALING THE COATED SHEET MATERIAL IN MULTI-PLY ASSEMBLY TO FORM ON SAID SHEET MATERIAL A TIGHTLY ADHERING COATING OF THE INORGANIC SEPARATOR MATERIAL.
Claim 2
Independent Claim
108 words
THE METHOD WHICH COMPRISES PROVIDING MAGNETIC SHEET MATERIAL WITH A COATING COMPOSED OF A SUSPENSION OF A FINELY DIVIDED REFRACTORY SEPARATOR MATERIAL IN WATER CONTAINING FROM ABOUT 0.3 TO 2, BY WEIGHT OF METHYL CELLULOSE, DRYING THE COATING, AT SUCH A TEMPERATURE AND SUCH A RATE THAT THE FILM FORMING PROPERTIES OF THE METHYL CELLULOSE ARE NOT DESTROYED, MECHANICALLY PROCESSING THE COATED MATERIAL TO PLACE IT IN THE PHYSICAL CONDITION DESIRED PRIOR TO THE FINAL ANNEAL THEREOF TO DEVELOP ITS OPTIMUM MAGNETIC PROPERTIES, AND BOX ANNEALING THE COATED SHEET MATERIAL IN MULTI-PLY ASSEMBLY TO FORM ON SAID SHEET MATERIAL A TIGHTLY ADHERING COATING OF THE INORGANIC SEPARATOR MATERIAL.
References Cited (Backward Citations)
US2316745A
Cited
US2515788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |