Patent US2821474A successfully refreshed from Google Patents.
US2821474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard ductile alloy
Assignee: Lunkenheimer Co
•
Filing: 1954-04-09
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Granted: 1958-01-28
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Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 Marvin L Steinbuch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:53
CPC Classifications
C; C22; C22C; C22C19/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A VALVE SEAT COMPRISING A CASTING OF AN ALLOY CONSISTING ESSENTIALLY OF 1/2 TO 5% COPER, 6 TO 12% SILICON, 9 TO 30% CHROMIUM, AND THE BALANCE NICKEL.
Claim 2
Dependent Claim
28 words
A VALVE SEAT COMPRISING A CASTING OF AN ALLOY CONSISTING ESSENTIALLY OF 1/2 TO 5% COPER, 6 TO 12% SILICON, 9 TO 30% CHROMIUM, AND THE BALANCE NICKEL.
References Cited (Backward Citations)
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US2521273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |