Patent US3440400A successfully refreshed from Google Patents.
US3440400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric duct heater
Assignee: LOUIS C COTTS
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Filing: 1966-09-27
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Granted: 1969-04-22
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Expires: 1986-09-27
Abstract
No abstract record available.
Inventors
- 👤 Louis C Cotts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:26
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
AN ELECTRIC DUCT HEATER ADAPTED TO BE CONNECTED TO INLET AND OUTLET AIR DUCTS, COMPRISING A HOUSING HAVING TOP, BOTTOM AND SIDE WALLS AND OPEN AT ITS ENDS FOR COMMUNICATION WITH SAID DUCTS, ONE OF SAID WALLS HAVING AN APERTURE THEREIN SPACED FROM ITS ENDS, A HEATER CARRIER MOUNTED IN SAID HOUSING SPACED FROM THREE OF THE WALLS THEREOF, SAID CARRIER DEFINING AN OPEN ENDED HEATING PASSAGE THERETHROUGH AND COOPERATING WITH SAID HOUSING TO DEFINE A SECOND PASSAGE, AND AN ELECTRIC HEATING ELEMENT SECURED TO SAID CARRIER AND POSITIONED WITHIN SAID HEATING PASSAGE, SAID ELECTRIC DUCT HEATER FURTHER HAVING A PLURALITY OF CARRIERS MOUNTED IN SAID HOUSING, SIDE BY SIDE, TO PROVIDE A PLURALITY OF SAID PASSAGES, EACH ADAPTED TO HAVE A HEATING ELEMENT THEREIN, AND TO INDEPENDENTLY SECURE EACH CARRIER TO SAID HOUSING.
Claim 2
Dependent Claim
134 words
AN ELECTRIC DUCT HEATER ADAPTED TO BE CONNECTED TO INLET AND OUTLET AIR DUCTS, COMPRISING A HOUSING HAVING TOP, BOTTOM AND SIDE WALLS AND OPEN AT ITS ENDS FOR COMMUNICATION WITH SAID DUCTS, ONE OF SAID WALLS HAVING AN APERTURE THEREIN SPACED FROM ITS ENDS, A HEATER CARRIER MOUNTED IN SAID HOUSING SPACED FROM THREE OF THE WALLS THEREOF, SAID CARRIER DEFINING AN OPEN ENDED HEATING PASSAGE THERETHROUGH AND COOPERATING WITH SAID HOUSING TO DEFINE A SECOND PASSAGE, AND AN ELECTRIC HEATING ELEMENT SECURED TO SAID CARRIER AND POSITIONED WITHIN SAID HEATING PASSAGE, SAID ELECTRIC DUCT HEATER FURTHER HAVING A PLURALITY OF CARRIERS MOUNTED IN SAID HOUSING, SIDE BY SIDE, TO PROVIDE A PLURALITY OF SAID PASSAGES, EACH ADAPTED TO HAVE A HEATING ELEMENT THEREIN, AND TO INDEPENDENTLY SECURE EACH CARRIER TO SAID HOUSING.
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |