US2818935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined centrifugal separator and heat exchanger
Assignee: Waagner Biro AG
•
Filing: 1954-10-26
•
Granted: 1958-01-07
•
Expires: 1974-10-26
Abstract
No abstract record available.
Inventors
- 👤 Kemmetmuller Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:01
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0058; B; B04; B04C; B04C3/00; B04C3/02; B04C5/00; B04C5/08; B04C5/081; B04C5/20; C; C10; C10K; C10K1/00; C10K1/02; F23; F23J; F23J15/00; F23J15/02; F23J15/022; F23J15/027; F28F; F28F9/00; F28F9/007; F28F9/013; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |