US3566514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing method for boiling surfaces
Assignee: Union Carbide Corp
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Filing: 1968-05-01
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Granted: 1971-03-02
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Expires: 1988-05-01
Abstract
Abstract A BOILING SURFACE LAYER IS FORMED FROM A THERMALLY CONDUCTIVE WALL BY FIRST CUTTING DEEP PARALLEL GROOVES WITH METAL REMOVAL, THEN CUTTING SHALLOWER GROOVES PARALLEL TO AND BETWEEN THE FIRST GROOVES, AND THEN KNURLING TO PROVIDE SUBSURFACE CAVITIES WITH RESTRICTED OPENINGS TO THE OUTER SURFACE.
Inventors
- 👤 Edward T Szumigala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/101; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |