US2729692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary field stirring device with independently driven fan
Assignee: Babcock and Wilcox Co
•
Filing: 1952-08-14
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Granted: 1956-01-03
•
Expires: 1972-08-14
Abstract
No abstract record available.
Inventors
- 👤 Temple W Ratcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:36
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/34; H05B2213/00; H05B2213/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR999012A
Cited
US1068558A
Cited
US1838806A
Cited
US1884637A
Cited
US2339964A
Cited
US2573319A
Cited
US2686823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |