US3552133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling unit
Assignee: Individual
•
Filing: 1968-02-20
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Granted: 1971-01-05
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Expires: 1988-02-20
Abstract
Abstract A HEATING AND COOLING UNIT COMPRISES A SEMI-CONDUCTOR THEREMOELECTRIC GENERATOR HAVING HOT AND COLD JUNCTIONS, THE HEAT EXCHANGING SURFACES OF ONE JUNCTION BEING LOCATED IN A DUCT NEAR THE ENTRANCE THEREOF WHILE THE HEAT EXCHANGING SURFACES OF THE OTHER JUNCTION ARE LOCATED IN A SECOND DUCT NEAR THE EXIT THEREOF, THE ARRANGEMENT BEING SUCH THAT AIR IS DRAWN THROUGH ONE DUCT FORM A FIRST SPACE TO A SECOND WHILE THE OTHER DUCT CONVEYS THE AIR FROM THE SECOND SPACE TO THE FIRST, THE AIR FLOWING IN OPPOSITE DIRECTIONS IN THE DUCTS.
Inventors
- 👤 Sergei Meerovich Lukomsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
F; F24; F24F; F24F5/00; F24F5/0042; F25; F25B; F25B21/00; F25B21/02; F25B21/04
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |