US3098776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of heat-treating low carbon steel
Assignee: AT&T Inc
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Filing: 1960-12-09
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Granted: 1963-07-23
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Expires: 1980-12-09
Abstract
No abstract record available.
Inventors
- 👤 Paul F Elarde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:44
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1272; C21D1/00; C21D1/74; C21D1/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF INCREASING THE MAGNETIC PERMEABILITY OF ORDINARY COMMERCIAL SAE 1010 LOW-CARBON STEEL FROM A MAXIMUM PERMEABILITY VALUE OF THE ORDER OF 2000 TO A MAXIMUM PERMEABILITY VALUE BETWEEN ABOUT 6000 AND 10,000 WHICH CONSISTS IN HEATING THE STEEL AT A TEMPERATURE BETWEEN ABOUT 1500 AND 1550*F. IN A WET FORMING GAS ATMOSPHERE FOR A PERIOD OF ABOUT 3 TO 6 HOURS, COOLING THE STEEL AT AN INITIAL RATE OF APPROXIMATELY 200*F. PER HOUR TO A TRANSITION TEMPERATURE OF APPROXIMATELY 1000*F. IN A DRY FORMING GAS ATMOSPHERE, AND THEN COOLING THE STEEL FURTHER AT AN INCREASED RATE OF APPROXIMATELY 400 TO 600*F. PER HOUR TO A TEMPERATURE AT LEAST AS LOW AS 200*F. IN A DRY FORMING GAS ATMOSPHERE, AFTER WHICH THE COOLING CONDITIONS ARE SUBSTANTIALLY IMMATERIAL.
Claim 2
Independent Claim
128 words
THE METHOD OF INCREASING THE MAGNETIC PERMEABILITY OF ORDINARY COMMERCIAL SAE 1010 LOW-CARBON STEEL FROM A MAXIMUM PERMEABILITY VALUE OF THE ORDER OF 2000 TO A MAXIMUM PERMEABILITY VALUE BETWEEN ABOUT 6000 AND 10,000 WHICH CONSISTS IN HEATING THE STEEL AT A TEMPERATURE BETWEEN ABOUT 1500 AND 1550*F. IN A WET FORMING GAS ATMOSPHERE FOR A PERIOD OF ABOUT 3 TO 6 HOURS, COOLING THE STEEL AT AN INITIAL RATE OF APPROXIMATELY 200*F. PER HOUR TO A TRANSITION TEMPERATURE OF APPROXIMATELY 1000*F. IN A DRY FORMING GAS ATMOSPHERE, AND THEN COOLING THE STEEL FURTHER AT AN INCREASED RATE OF APPROXIMATELY 400 TO 600*F. PER HOUR TO A TEMPERATURE AT LEAST AS LOW AS 200*F. IN A DRY FORMING GAS ATMOSPHERE, AFTER WHICH THE COOLING CONDITIONS ARE SUBSTANTIALLY IMMATERIAL.
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) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |