US2934322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1955-09-01
•
Granted: 1960-04-26
•
Expires: 1975-09-01
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Hazard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:54
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/12; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0308; F28F9/00; F28F9/02; F28F9/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1622376A
Cited
US1838722A
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US2058871A
Cited
US1994903A
Cited
US1931247A
Cited
US1926978A
Cited
GB411625A
Cited
US2312087A
Cited
US2539105A
Cited
US2613920A
Cited
US2724242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |