US3265865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical duct heater
Assignee: Armstrong World Industries Inc
•
Filing: 1963-10-09
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Granted: 1966-08-09
•
Expires: 1983-10-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Nathaniel E Hager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:16
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/40; H05B3/42; H05B3/48; H05B3/50; H05B2203/00; H05B2203/022; H05B2203/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
AN ELECTRIC DUCT HEATER COMPRISING (1) A HOUSING AND (2) A ROLLER HEATING ASSEMBLY POSITIONED WITHIN THE HOUSING, THE HEATING ASSEMBLY COMPRISING (A) AN ELECTRICALLY CONDUCTIVE METALLIC FOIL HEATING ELEMENT HAVING A THICKNESS IN THE RANGE OF ABOUT 0.01-0.0001 INCH AND A WIDTH IN THE RANGE OF ABOUT 1/8-2 INCHES AND HAVING ELECTRICAL POWER CONNECTIONS THEREON, (B) A PAPER SUPPORT SECURED TO SAID HEATING ELEMENT, SAID SUPPORTING COMPRISING (A) A PLANE PAPER BACKING SHEET AND (B) A CORRUGATED P.APER SHEET AFFIXED THERETO TO FORM A ALTERNATE GROOVES AND RIDGES WHICH, WHEN SAID SUPPORT IS IN A ROLLED CONFIGURATION, DEFINE A MULTITUDE OFF PARALLEL CONTINUOUS AIR-COVEYING PASSAGES APPROXIMATELY HALF OF WHICH ARE LINED AT LEAST IN PART WITH SAIKD HEATING ELEMENT.
Claim 2
Dependent Claim
120 words
AN ELECTRIC DUCT HEATER COMPRISING (1) A HOUSING AND (2) A ROLLER HEATING ASSEMBLY POSITIONED WITHIN THE HOUSING, THE HEATING ASSEMBLY COMPRISING (A) AN ELECTRICALLY CONDUCTIVE METALLIC FOIL HEATING ELEMENT HAVING A THICKNESS IN THE RANGE OF ABOUT 0.01-0.0001 INCH AND A WIDTH IN THE RANGE OF ABOUT 1/8-2 INCHES AND HAVING ELECTRICAL POWER CONNECTIONS THEREON, (B) A PAPER SUPPORT SECURED TO SAID HEATING ELEMENT, SAID SUPPORTING COMPRISING (A) A PLANE PAPER BACKING SHEET AND (B) A CORRUGATED P.APER SHEET AFFIXED THERETO TO FORM A ALTERNATE GROOVES AND RIDGES WHICH, WHEN SAID SUPPORT IS IN A ROLLED CONFIGURATION, DEFINE A MULTITUDE OFF PARALLEL CONTINUOUS AIR-COVEYING PASSAGES APPROXIMATELY HALF OF WHICH ARE LINED AT LEAST IN PART WITH SAIKD HEATING ELEMENT.
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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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |