US2779573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air preheater
Assignee: JFE Engineering Corp
•
Filing: 1952-10-30
•
Granted: 1957-01-29
•
Expires: 1972-10-30
Abstract
No abstract record available.
Inventors
- 👤 Kuroda Shigeyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/04; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/07; Y10S165/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US924409A
Cited
US1538827A
Cited
US1576410A
Cited
US1681256A
Cited
GB273605A
Cited
US1672267A
Cited
US2115769A
Cited
US2590465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |