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Patent US2868513A successfully refreshed from Google Patents.
US2868513A
Expired / Lapsed
US
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Heat exchanger
Assignee: Pfaudler Permutit Inc
•
Filing: 1957-02-06
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Granted: 1959-01-13
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Expires: 1977-02-06
Abstract
No abstract record available.
Inventors
- 👤 Stanley C Orr
- 👤 Donald E Kropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:20
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0219; F28F2275/00; F28F2275/20
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |