US3189492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cast iron of high magnetic permeability
Assignee: Valeo Engine Cooling Inc
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Filing: 1963-01-29
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Granted: 1965-06-15
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Expires: 1983-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry B Laudenslager
- 👤 Everett W Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:48
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C22C37/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H02; H02K; H02K17/00; H02K17/02; H02K17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A CAST IRON OF HIGH MAGNETIC PERMEABILITY COMPRISING ABOUT 1.75% TO 2.3% CARBON, ABOUT 2% TO 4% SILICON, UP TO ABOUT 0.02% SULFUR, UP TO ABOUT 0.05% PHOSPHORUS, UP TO ABOUT 0.4% MANGANESE, ABOUT 0.025% TO 0.05% MAGNESIUM AND THE BALANCE IRON WITH USUAL IMPURITIES IN ORDINARY AMOUNTS, SAID IRON HAVING BEEN CAST WHITE AND HAVING BEEN ANNEALED BY A MALLEABLE IRON HEAT TREATMENT CYCLE TO CONVER THE CARBON TO TEMPER CARBON, SAID IRON HAVING A PERMEABILITY OF AT LEAST ABOUT 80 KILOLINES/IN.2 AT 40 AMPERE TURNS PER INCH.
Claim 2
Dependent Claim
89 words
A CAST IRON OF HIGH MAGNETIC PERMEABILITY COMPRISING ABOUT 1.75% TO 2.3% CARBON, ABOUT 2% TO 4% SILICON, UP TO ABOUT 0.02% SULFUR, UP TO ABOUT 0.05% PHOSPHORUS, UP TO ABOUT 0.4% MANGANESE, ABOUT 0.025% TO 0.05% MAGNESIUM AND THE BALANCE IRON WITH USUAL IMPURITIES IN ORDINARY AMOUNTS, SAID IRON HAVING BEEN CAST WHITE AND HAVING BEEN ANNEALED BY A MALLEABLE IRON HEAT TREATMENT CYCLE TO CONVER THE CARBON TO TEMPER CARBON, SAID IRON HAVING A PERMEABILITY OF AT LEAST ABOUT 80 KILOLINES/IN.2 AT 40 AMPERE TURNS PER INCH.
References Cited (Backward Citations)
US2578794A
Cited
GB678487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |