US2802624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for calculating heat exchanger performance
Assignee: Individual
•
Filing: 1951-08-17
•
Granted: 1957-08-13
•
Expires: 1971-08-17
Abstract
No abstract record available.
Inventors
- 👤 Carl F Kayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:13
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1206968A
Cited
US2040086A
Cited
CH252807A
Cited
US2519615A
Cited
US2598267A
Cited
GB605822A
Cited
US2630968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |