US3606404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct-to-register connector
Assignee: Nortek Global HVAC LLC
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Filing: 1968-12-18
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Granted: 1971-09-20
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Expires: 1988-12-18
Abstract
Abstract OPENINGS IN AIR DUCTS, BENEATH FLOOR AND WALL SURFACES, ARE CUT BY A ROUTING PROCESS, AND CONNECTED TO RECTANGULAR SURFACE REGISTER APERTURES BY A READILY INSTALLED DUCT CONNECTOR SECTION. USING THE SURFACE FOR ALIGNMENT AND ITS APERTURE EDGE FOR GUIDING A CIRCULAR BEARING GUIDE, A ROUTING TOOL PROJECTS THROUGH THE APERTURE TO CUT A REGISTERING, SMALLER RECTANGULAR DUCT OPENING. ONTO THE MARGIN AROUND THE DUCT OPENING IS INSTALLED THE INWARD END OF A DUCT CONNECTOR SECTION, WHOSE PROJECTING TABS ARE MANUALLY BENT INTO THE OPENING FOR SECUREMENT.
Inventors
- 👤 John L Mcgann Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:31
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/17; F16L9/003; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |