US2951685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Foster Wheeler Inc
•
Filing: 1954-11-12
•
Granted: 1960-09-06
•
Expires: 1974-11-12
Abstract
No abstract record available.
Inventors
- 👤 Bliss Charles
- 👤 Kenneth R Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:12
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/04; F22; F22B; F22B1/00; F22B1/02; F22B1/16; F23M; F23M20/00; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/228; Y10S165/30; Y10S165/921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2072166A
Cited
US1814011A
Cited
US1785334A
Cited
GB282717A
Cited
US1853684A
Cited
US2287268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |