US2812923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheater washing device
Assignee: Alstom Power Inc
•
Filing: 1954-03-11
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Granted: 1957-11-12
•
Expires: 1974-03-11
Abstract
No abstract record available.
Inventors
- 👤 Schoenherr Karl Ernest
- 👤 George E Rosenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
F; F28; F28G; F28G9/00; F28G9/005; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/01; Y10S165/012
Claims Analysis
Total Claims: 0
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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) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |