US2447306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid heater
Assignee: Babcock and Wilcox Co
•
Filing: 1943-09-16
•
Granted: 1948-08-17
•
Expires: 1963-09-16
Abstract
No abstract record available.
Inventors
- 👤 Ervin G Bailey
- 👤 Ralph M Hardgrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:33
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/02; C; C03; C03B; C03B5/00; C03B5/16; C03B5/235; C03B5/237; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14; Y; Y02; Y02P; Y02P40/00; Y02P40/50
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |