US2895508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange conduit
Assignee: PATTERSON KELLEY CO Inc
•
Filing: 1955-11-23
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Granted: 1959-07-21
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Expires: 1975-11-23
Abstract
No abstract record available.
Inventors
- 👤 Charles E Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:01
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28F1/00; F28F1/10; F28F1/40
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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |