US2967047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus having centrifugal fan
Assignee: Babcock and Wilcox Co
•
Filing: 1953-10-28
•
Granted: 1961-01-03
•
Expires: 1973-10-28
Abstract
No abstract record available.
Inventors
- 👤 Donald C Schluderberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:31
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0236; F28F9/0241; F23; F23L; F23L5/00; F23L5/02; F28D; F28D7/00; F28D7/16; F28D7/1607
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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |