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US2806677A
Expired / Lapsed
US
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Metallic heat exchanger for high temperature gases
Assignee: IND COMPANIE
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Filing: 1955-09-01
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Granted: 1957-09-17
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Expires: 1975-09-01
Abstract
No abstract record available.
Inventors
- 👤 Jacobs Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR889950A
Cited
US2742269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |