US3086441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air curtain device
Assignee: NAT IND EQUIPMENT CO
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Filing: 1961-10-06
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Granted: 1963-04-23
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Expires: 1981-10-06
Abstract
No abstract record available.
Inventors
- 👤 London Stuart Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:41
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/075; F24F9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
AN AIR CURTAIN DEVICE COMPRISING A HOUSING, SAID HOUSING HAVING AN OPEN TOP AND CLOSED SIDES, SAID HOUSING HAVING A SUBSTANTIALLY PLANAR BOTTOM CURVED DOWNWARDLY NEAR THE REAR SIDE OF SAID HOUSING TO DEFINE A NARROW ELONGATED DISCHARGE OPENING HAVING VERTICAL WALLS, A PLURALITY OF TRANSVERSE VANES EXTENDING BETWEEN SAID VERTICAL WALLS, A SUBSTANTIALLY HORIZONTAL SOLID DIAPHRAGM JOINED TO SAID SIDES AND SPANNING THE INTERIOR OF SAID HOUSING, SAID DIAPHRAGM HAVING FAN OPENINGS THEREIN, BEAMS SPANNING THE INTERIOR OF SAID HOUSING, MEANS FOR SUPPORTING SAID BEAMS ON SAID DIAPHRAGM, A PLURALITY OF DRIVING MOTORS HAVING SHAFTS, MEANS FOR SUPPORTING SAID MOTORS ON SAID BEAMS WITH SAID SHAFTS IN AXIAL ALIGNMENT WITH SAID FAN OPENINGS, AND PROPELLER FANS ON SAID SHAFTS OF SAID MOTORS AND DISPOSED IN SAID OPENINGS.
Claim 2
Dependent Claim
128 words
AN AIR CURTAIN DEVICE COMPRISING A HOUSING, SAID HOUSING HAVING AN OPEN TOP AND CLOSED SIDES, SAID HOUSING HAVING A SUBSTANTIALLY PLANAR BOTTOM CURVED DOWNWARDLY NEAR THE REAR SIDE OF SAID HOUSING TO DEFINE A NARROW ELONGATED DISCHARGE OPENING HAVING VERTICAL WALLS, A PLURALITY OF TRANSVERSE VANES EXTENDING BETWEEN SAID VERTICAL WALLS, A SUBSTANTIALLY HORIZONTAL SOLID DIAPHRAGM JOINED TO SAID SIDES AND SPANNING THE INTERIOR OF SAID HOUSING, SAID DIAPHRAGM HAVING FAN OPENINGS THEREIN, BEAMS SPANNING THE INTERIOR OF SAID HOUSING, MEANS FOR SUPPORTING SAID BEAMS ON SAID DIAPHRAGM, A PLURALITY OF DRIVING MOTORS HAVING SHAFTS, MEANS FOR SUPPORTING SAID MOTORS ON SAID BEAMS WITH SAID SHAFTS IN AXIAL ALIGNMENT WITH SAID FAN OPENINGS, AND PROPELLER FANS ON SAID SHAFTS OF SAID MOTORS AND DISPOSED IN SAID OPENINGS.
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) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |