US2931636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature heat treatment of metals
Assignee: Individual
•
Filing: 1958-03-17
•
Granted: 1960-04-05
•
Expires: 1978-03-17
Abstract
No abstract record available.
Inventors
- 👤 William E Engelhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:47
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US446947A
Cited
DE666965C
Cited
US1333225A
Cited
US1997680A
Cited
US2124764A
Cited
US2480293A
Cited
US2744745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |