Patent US2995343A successfully refreshed from Google Patents.
US2995343A
Expired / Lapsed
US
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Heat exchanger construction
Assignee: Griscom Russell Co
•
Filing: 1957-07-29
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Granted: 1961-08-08
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Karl A Gardner
- 👤 Jr Frank Boni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:20
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/06; F22B1/063; F22G; F22G1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2409780A
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US2665556A
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US2809810A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |