Patent US2742356A successfully refreshed from Google Patents.
US2742356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cast valve seat insert
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1954-10-07
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Granted: 1956-04-17
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Expires: 1974-10-07
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Prasse
- 👤 Adna A Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:04
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A CAST VALVE SEAT INSERT COMPRISING A RING HAVING THE FOLLOWING COMPOSITION: PERCENT CARBON --------------2.25 TO 2.75 NICKEL --------------- 37 TO 40 CHROMIUM ----------------- 18 TO 22 COBALT ------------------- 10 TO 14 METAL SELECTED FROM THE GROUP CONSISTING OF IRON ------------ SUBSTANTIALLY THE BALANCE
Claim 2
Dependent Claim
44 words
A CAST VALVE SEAT INSERT COMPRISING A RING HAVING THE FOLLOWING COMPOSITION: PERCENT CARBON --------------2.25 TO 2.75 NICKEL --------------- 37 TO 40 CHROMIUM ----------------- 18 TO 22 COBALT ------------------- 10 TO 14 METAL SELECTED FROM THE GROUP CONSISTING OF IRON ------------ SUBSTANTIALLY THE BALANCE
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |