Patent US2681209A successfully refreshed from Google Patents.
US2681209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction device for rotary regenerative preheaters
Assignee: JARVIS C MARBLE
•
Filing: 1950-01-31
•
Granted: 1954-06-15
•
Expires: 1970-01-31
Abstract
No abstract record available.
Inventors
- 👤 Ernst H Mudersbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:29
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/015
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1829996A
Cited
US1649605A
Cited
US1970127A
Cited
US2337907A
Cited
US2468826A
Cited
US2499358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |