US3039745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heater
Assignee: Foster Wheeler Inc
•
Filing: 1959-01-02
•
Granted: 1962-06-19
•
Expires: 1979-01-02
Abstract
No abstract record available.
Inventors
- 👤 Montrose K Drewry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:23
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F23; F23L; F23L15/00; F23L15/02; Y; Y02; Y02E; Y02E20/00; Y02E20/34
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |