US3220713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory heat exchanger
Assignee: ANDCO INCORPORATED A CORP OF NY
•
Filing: 1962-08-09
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Granted: 1965-11-30
•
Expires: 1982-08-09
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:29
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/04; F28D; F28D17/00; F28D17/02; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A HEAT EXCHANGER COMPRISING FIRST CONDUIT MEANS HAVING A CORE OF HEAT ABSORPTIVE AND HEAT RADIANT MATERIAL AND PROVIDING RELATIVELY UNIMPEDED FLOW OF HOT GAS LONGITUDINALLY THEREIN, SECOND CONDUIT MEANS SURROUNDING SAID FIRST CONDUIT TO CHANNEL A FLOW OF LOWER TEMPERATURE GAS IN HEAT-EXCHANGING RELATION WITH THE HOT GAS FLOW, AND SPACER MEANS DISPOSED WITHIN THE ANNULAR SPACE BETWEEN SAID FIRST AND SECOND CONDUIT MEANS FOR SEPARATING SAID FIRST AND SECOND CONDUIT MEANS TO DEFINE AT ANNULAR CROSS SECTIONAL CHANNEL FOR SAID FLOW OF LOWER TEMPERATURE GAS WITHOUT IMPEDING THE FREE FLOW OF GASES LONGITUDINALLY WITHIN SAID ANNULAR CROSS SECTION CHANNEL.
Claim 2
Dependent Claim
101 words
A HEAT EXCHANGER COMPRISING FIRST CONDUIT MEANS HAVING A CORE OF HEAT ABSORPTIVE AND HEAT RADIANT MATERIAL AND PROVIDING RELATIVELY UNIMPEDED FLOW OF HOT GAS LONGITUDINALLY THEREIN, SECOND CONDUIT MEANS SURROUNDING SAID FIRST CONDUIT TO CHANNEL A FLOW OF LOWER TEMPERATURE GAS IN HEAT-EXCHANGING RELATION WITH THE HOT GAS FLOW, AND SPACER MEANS DISPOSED WITHIN THE ANNULAR SPACE BETWEEN SAID FIRST AND SECOND CONDUIT MEANS FOR SEPARATING SAID FIRST AND SECOND CONDUIT MEANS TO DEFINE AT ANNULAR CROSS SECTIONAL CHANNEL FOR SAID FLOW OF LOWER TEMPERATURE GAS WITHOUT IMPEDING THE FREE FLOW OF GASES LONGITUDINALLY WITHIN SAID ANNULAR CROSS SECTION CHANNEL.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |