US2813708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices to improve flow pattern and heat transfer in heat exchange zones of brick-lined furnaces
Assignee: Individual
•
Filing: 1951-10-08
•
Granted: 1957-11-19
•
Expires: 1971-10-08
Abstract
No abstract record available.
Inventors
- 👤 Frey Kurt Paul Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:50
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F23; F23M; F23M20/00; F27; F27B; F27B3/00; F27B3/10; F27B3/26; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/03; Y10S165/032; Y10S165/034
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |