US1378326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pair-heating furnace and method of operating the same
Assignee: Individual
•
Filing: 1919-12-16
•
Granted: 1921-05-17
•
Expires: 1939-12-16
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Costello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:22
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/22; C; C21; C21D; C21D9/00; C21D9/70; F27D; F27D3/00; F27D3/02; F27D3/022; F27D3/024; F27B9/02; F27B9/021; F27B9/30; F27B9/3044; F27M; F27M2002/00; F27M2002/01; F27M2002/013; F27M2002/016
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-05-16 | 1924-11-15 | 1925-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-05-16 | 1928-11-15 | 1929-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-05-16 | 1932-11-15 | 1933-05-17 | $7700.00 | Window Closed / Lapsed |