US2502770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heater
Assignee: Carnegie Illinois Steel Corp
•
Filing: 1945-11-16
•
Granted: 1950-04-04
•
Expires: 1965-11-16
Abstract
No abstract record available.
Inventors
- 👤 Coleman H Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:56
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/60; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE20673E
Cited
US1676685A
Cited
US1980875A
Cited
US1997741A
Cited
US2040343A
Cited
US2304225A
Cited
US2301589A
Cited
US2393363A
Cited
US2349569A
Cited
US2427485A
Cited
US2417030A
Cited
US2417029A
Cited
US2459507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |