Patent US3024142A successfully refreshed from Google Patents.
US3024142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic alloys
Assignee: Post Office
•
Filing: 1959-08-31
•
Granted: 1962-03-06
•
Expires: 1979-08-31
Abstract
No abstract record available.
Inventors
- 👤 Parkin Bernard George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:03
CPC Classifications
C; C22; C22C; C22C19/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14708
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF PRODUCING A NICKEL-IRON ALLOY HAVING A SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP WITH A RATIO OF FLUX AT REMANENCE TO FLUX AT MAXIMUM MAGNETIC FIELD EQUAL TO AT LEAST 0.9, WHICH CONSISTS OF THE FOLLOWING STEPS: COMBINING NICKEL AND IRON IN THE RELATIVE PROPORTIONS OF BETWEEN 60:40 AND 72:28 WITH THE ADDITION OF RSISTIVITYINCREASING METAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM, CHROMIUM, TUNGSTEN AND MANGANES IN AN AMOUNT SUFFICIENT TO GIVE THE ALLOYA RESISTIVITY IN EXCESS OF 40 MICROHM-CENTRIMETERS, AND SUBJECTING THE ALLOY TO HEAT TREATMENT IN A MAGNETIC FIELD AT A SUBTANTIALLY CONSTANT TEMPERATURE OF BETWEEN 400 DEGREES C. AND 490 DEGREES C. FOR A PERIOD OF TIME, NOT LESS THAN SIX HOURS SUFFICIENT TO IMPART THERETO THE SAID RECTANGULAR HYSTERESIS LOOP.
Claim 2
Independent Claim
125 words
A METHOD OF PRODUCING A NICKEL-IRON ALLOY HAVING A SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP WITH A RATIO OF FLUX AT REMANENCE TO FLUX AT MAXIMUM MAGNETIC FIELD EQUAL TO AT LEAST 0.9, WHICH CONSISTS OF THE FOLLOWING STEPS: COMBINING NICKEL AND IRON IN THE RELATIVE PROPORTIONS OF BETWEEN 60:40 AND 72:28 WITH THE ADDITION OF RSISTIVITYINCREASING METAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM, CHROMIUM, TUNGSTEN AND MANGANES IN AN AMOUNT SUFFICIENT TO GIVE THE ALLOYA RESISTIVITY IN EXCESS OF 40 MICROHM-CENTRIMETERS, AND SUBJECTING THE ALLOY TO HEAT TREATMENT IN A MAGNETIC FIELD AT A SUBTANTIALLY CONSTANT TEMPERATURE OF BETWEEN 400 DEGREES C. AND 490 DEGREES C. FOR A PERIOD OF TIME, NOT LESS THAN SIX HOURS SUFFICIENT TO IMPART THERETO THE SAID RECTANGULAR HYSTERESIS LOOP.
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) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |