Patent US1947677A successfully refreshed from Google Patents.
Patent US2981621A successfully refreshed from Google Patents.
US2981621A
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US
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High temperature nickel-iron base alloy
Assignee: Sierra Metals Corp
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Filing: 1957-07-29
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Granted: 1961-04-25
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Rudolf H Thielemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:55
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/48; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; C22C38/44; C22C38/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A METAL ALLOY CONSISTING ESSENTIALLY OF, BY WEIGHT: 10 TO 20 PERCENT CHROMIUM; 18 TO 50 PERCENT NICKEL; 1.5 TO 8 PERCENT TUNGSTEN; 1 TO 5 PERCENT OF A METAL OF THE CLASS CONSISTING OF COLUMBIUM, TANTALUM AND MIXTURES THEREOF; 2 TO 4 PERCENT TITANIUM; 0.5 TO 0.25 PERCENT CARBON; AND THE BALANCE, IRON.
Claim 2
Dependent Claim
54 words
A METAL ALLOY CONSISTING ESSENTIALLY OF, BY WEIGHT: 10 TO 20 PERCENT CHROMIUM; 18 TO 50 PERCENT NICKEL; 1.5 TO 8 PERCENT TUNGSTEN; 1 TO 5 PERCENT OF A METAL OF THE CLASS CONSISTING OF COLUMBIUM, TANTALUM AND MIXTURES THEREOF; 2 TO 4 PERCENT TITANIUM; 0.5 TO 0.25 PERCENT CARBON; AND THE BALANCE, IRON.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |