US2669445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treating apparatus
Assignee: Holcroft and Co
•
Filing: 1950-02-13
•
Granted: 1954-02-16
•
Expires: 1970-02-13
Abstract
No abstract record available.
Inventors
- 👤 Walter H Holcroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:51
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/63; C21D9/00; C21D9/0006; C21D9/0018
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US357234A
Cited
US1168313A
Cited
DE380761C
Cited
US1702524A
Cited
US671989A
Cited
GB191229326A
Cited
US1460323A
Cited
US1468944A
Cited
US1550340A
Cited
US1531407A
Cited
FR649816A
Cited
US1979108A
Cited
DE639716C
Cited
US2086970A
Cited
US2223603A
Cited
US2589311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |