Patent US3207209A successfully refreshed from Google Patents.
US3207209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for increasing the heat transfer coefficient between a wall and boiling liquid
Assignee: Department Of Chemical Engineering &
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Filing: 1962-12-28
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Granted: 1965-09-21
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Expires: 1982-12-28
Abstract
No abstract record available.
Inventors
- 👤 Richard L Hummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:18
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; F28F2245/00; F28F2245/02; F28F2245/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
A METHOD FOR TREATING A WALL OF METALLIC HEAT TRANSFER ELEMENT TO INCREASE THE BOILING FILM HEAT TRANSFER COEFFICIENT THEREOF WHEN SAID SURFACE IS IN CONTACT WITH A BOILING FLUID, SAID METHOD COMPRISING FORMING A PLURALITY OF HYDROPHILIC AREAS ON THE SURFACE OF SAID WALL, FORMING A PLURALITY OF HYDROPHOBIC AREAS ON SAID WALL INTERSPEED THROUGHOUT SAID HYDROPHILIC AREAS, SAID HYDROPHILIC AND HYDROPHOBIC AREAS BEING MICROSCOPIC OR NEAR-MICROSCOPIC IN SIZE, SAID HYDROPHOBIC AREAS PROVIDING BUBBLE NUCLEI FORMING POINTS FOR A BOILING FLUID, SAID HYDROPHILIC AREAS PROVIDING BUBBLE GROWTH AREAS FOR SAID BUBBLE NUCLEI.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |