US3014274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving metal surfaces
Assignee: RTX Corp
•
Filing: 1957-07-22
•
Granted: 1961-12-26
•
Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Norman F Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:35
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; B; B21; B21J; B21J5/00; B23; B23P; B23P9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1998108A
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US2040957A
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US2057669A
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US2904873A
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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) | 1964-12-25 | 1965-06-26 | 1965-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-25 | 1969-06-26 | 1969-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-25 | 1973-06-26 | 1973-12-26 | $7700.00 | Window Closed / Lapsed |