Patent US2553706A successfully refreshed from Google Patents.
US2553706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel spring
Assignee: Armco Inc
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Filing: 1947-01-31
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Granted: 1951-05-22
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Expires: 1967-01-31
Abstract
No abstract record available.
Inventors
- 👤 George N Goller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:53
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/02; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/908
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
COLD-WORKED AND PRECIPITATION-HARDENED STAINLESS STEEL WIRE, SHEET AND STRIP SPRINGS HAVING A PROPORTIONAL LIMIT OF ABOUT 65,000 TO 195,000 P. S, I. OR MORE AND CONTAINING IN APPROXIMATE PERCENTAGES, 16.5% CHROMIUM, FROM 2,85% TO 6.60% NICKEL, 3.0% TO 5.0% COPPER, CARBON UP TO 0.1L% AND NITROGEN UP TO 0.13% TOGETHER NOT EXCEEDING 0.21%, AND THE REMAINDER SUBSTANTIALLY ALL IRON HAVING BEEN SUBJECTED TO ANNEALING AT 1700% F. TO 2100* F., COLD-WORKING 5% TO 90%, AND PRECIPITATION TREATMENT AT 800* F. TO 950* F.
Claim 2
Dependent Claim
83 words
COLD-WORKED AND PRECIPITATION-HARDENED STAINLESS STEEL WIRE, SHEET AND STRIP SPRINGS HAVING A PROPORTIONAL LIMIT OF ABOUT 65,000 TO 195,000 P. S, I. OR MORE AND CONTAINING IN APPROXIMATE PERCENTAGES, 16.5% CHROMIUM, FROM 2,85% TO 6.60% NICKEL, 3.0% TO 5.0% COPPER, CARBON UP TO 0.1L% AND NITROGEN UP TO 0.13% TOGETHER NOT EXCEEDING 0.21%, AND THE REMAINDER SUBSTANTIALLY ALL IRON HAVING BEEN SUBJECTED TO ANNEALING AT 1700% F. TO 2100* F., COLD-WORKING 5% TO 90%, AND PRECIPITATION TREATMENT AT 800* F. TO 950* F.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |