US2904321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid bath furnace and methods for continuous heat treatment of articles of manufacture
Assignee: Individual
•
Filing: 1953-03-13
•
Granted: 1959-09-15
•
Expires: 1973-03-13
Abstract
No abstract record available.
Inventors
- 👤 Bostroem Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:13
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/48
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US70881A
Cited
US752768A
Cited
US1224340A
Cited
US2025990A
Cited
US1916407A
Cited
US1811522A
Cited
US1872712A
Cited
US1990707A
Cited
US2134457A
Cited
US2141382A
Cited
US2311099A
Cited
US2216544A
Cited
US2309745A
Cited
US2316144A
Cited
US2338165A
Cited
US2424034A
Cited
US2488997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |