US2746727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Return bend heat exchanger and process for manufacture
Assignee: Individual
•
Filing: 1953-06-11
•
Granted: 1956-05-22
•
Expires: 1973-06-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Ralph W Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:34
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; B; B21; B21D; B21D53/00; B21D53/02; B21D53/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US6929A
Cited
US169392A
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US735307A
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US804732A
Cited
US1217101A
Cited
US1788068A
Cited
US2432082A
Cited
US2477210A
Cited
US2557579A
Cited
US2650636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |