US2592216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Return fire tube boiler with indirectly heated domestic supply
Assignee: Individual
•
Filing: 1947-01-02
•
Granted: 1952-04-08
•
Expires: 1967-01-02
Abstract
No abstract record available.
Inventors
- 👤 Watts Albert Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:21
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/28; F22; F22B; F22B9/00; F22B9/10; F22B9/12; F22B9/14; F24H1/48; F24H1/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US85000A
Cited
US375282A
Cited
US1751533A
Cited
US1826253A
Cited
US1986914A
Cited
US2046569A
Cited
US2205911A
Cited
US2230087A
Cited
US2354932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |