US2582871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Pfaudler Inc
•
Filing: 1948-07-31
•
Granted: 1952-01-15
•
Expires: 1968-07-31
Abstract
No abstract record available.
Inventors
- 👤 Edwin K Kintner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:39
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/08; F28F3/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB413811A
Cited
US2015819A
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US2039216A
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FR800478A
Cited
GB496830A
Cited
US2229306A
Cited
GB528223A
Cited
US2252916A
Cited
GB529340A
Cited
US2256904A
Cited
US2428880A
Cited
US2379671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |