US2650031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-temperature liquid heat system
Assignee: John B. Pierce Laboratory
•
Filing: 1950-05-31
•
Granted: 1953-08-25
•
Expires: 1970-05-31
Abstract
No abstract record available.
Inventors
- 👤 Robert A Hitch
- 👤 Fano Ettore Da
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:15
CPC Classifications
B; B01; B01B; B01B1/00; C; C09; C09K; C09K5/00; C09K5/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR351200A
Cited
US1437187A
Cited
GB415350A
Cited
US2100671A
Cited
US2223407A
Cited
US2335012A
Cited
US2290347A
Cited
US2360665A
Cited
US2471538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |