US3253908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel and method
Assignee: Armco Inc
•
Filing: 1959-11-20
•
Granted: 1966-05-31
•
Expires: 1979-11-20
Abstract
No abstract record available.
Inventors
- 👤 Tanczyn Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:56
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A CHROMIUM-NICKEL-ALUMINUM STAINLSS STEEL SUSCEPTIBLE TO PRECIPITATION-HARDENING BY DOUBLE HEAT-TREATMENT FROM A SOFT, WORKABLE, AUSTENITIC CONDITION TO GIVE GREAT STRENGTH IN COMBINATION WITH GOOD DUCTILITY, SAID STEEL CONSISTING ESSENTIALLY OF 9.00% TO 20.00% CHROMIUM, 2.50% TO 8.00% NICKEL, .70% TO 2.50% ALUMINUM, 1% TO 5% MOLYBDENUM, WITH THE SUM OF THE CHROMIUM AND MOLYBDENUM CONTENTS 14% TO 21%, .10% TO .40% NITROGEN, CARBON .12% MAXIMUM, MANGANESE 8.00% MAXIMUM, WITH MANGANESE INVERSELY PROPORTIONED WITH RESPECT TO THE NICKEL CONTENT, SILICON 2.00% MAXIMUM, PHOSPHORUS .050% MAXIMUM, SULPHUR .050% MAXIMUM, AND REMAINDER SUBSTANTIALLY ALL IRON.
Claim 2
Dependent Claim
92 words
A CHROMIUM-NICKEL-ALUMINUM STAINLSS STEEL SUSCEPTIBLE TO PRECIPITATION-HARDENING BY DOUBLE HEAT-TREATMENT FROM A SOFT, WORKABLE, AUSTENITIC CONDITION TO GIVE GREAT STRENGTH IN COMBINATION WITH GOOD DUCTILITY, SAID STEEL CONSISTING ESSENTIALLY OF 9.00% TO 20.00% CHROMIUM, 2.50% TO 8.00% NICKEL, .70% TO 2.50% ALUMINUM, 1% TO 5% MOLYBDENUM, WITH THE SUM OF THE CHROMIUM AND MOLYBDENUM CONTENTS 14% TO 21%, .10% TO .40% NITROGEN, CARBON .12% MAXIMUM, MANGANESE 8.00% MAXIMUM, WITH MANGANESE INVERSELY PROPORTIONED WITH RESPECT TO THE NICKEL CONTENT, SILICON 2.00% MAXIMUM, PHOSPHORUS .050% MAXIMUM, SULPHUR .050% MAXIMUM, AND REMAINDER SUBSTANTIALLY ALL IRON.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |