US2680598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchanging apparatus having cooled partition walls
Assignee: JARVIS C MARBLE
•
Filing: 1951-02-16
•
Granted: 1954-06-08
•
Expires: 1971-02-16
Abstract
No abstract record available.
Inventors
- 👤 Trulsson Sven Ivar
- 👤 Nilsson Hans Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:24
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/54; F28; F28D; F28D19/00; F28D19/04; F28D19/041; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |