US2425751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for flame hardening gear teeth
Assignee: Linde Air Products Co
•
Filing: 1940-06-29
•
Granted: 1947-08-19
•
Expires: 1960-06-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank Mcguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:52
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1514650A
Cited
US1768159A
Cited
DE513715C
Cited
GB446821A
Cited
US2054425A
Cited
US2102040A
Cited
US2132110A
Cited
US2067549A
Cited
US2148666A
Cited
US2189460A
Cited
US2196902A
Cited
US2208212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |