US3332334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air curtain apparatus
Assignee: Individual
•
Filing: 1965-08-09
•
Granted: 1967-07-25
•
Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Melzer Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:13
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F13/00; F24F13/02; F24F13/06; F24F9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
AN APPARATUS FOR PRODUCING AN AIR CURTAIN OF SUBSTANTIALLY UNIFORM DENSITY AND AIR FLOW RATE WHICH IS DIRECTED ACROSS A DOORWAY IN SUBSTANTIALLY THE SAME OUTLINE AS SAID DOORWAY, COMPRISING: A ROTATABLE PUMP HAVING AN INLET FOR GENERATING A SUBSTANTIALLY CONTINUOUS SUPERATMOSPHERIC PRESSURE OUTFLOW OF AIR, A VOLUTE CROSS SECTION PLENUM CHAMBER WHICH IS PRESSURIZED TO ABOVE ATMOSPHERIC PRESSURE BY SAID PUMP, MEANS FOR MOUNTING SAID PUMP INTERNALLY OF SAID PLENUM CHAMBER, SAID MOUNTING MEANS BEING DISPOSED AT A LOCATION WHICH IS IN NONINTERFERRING POSITION WITH THE FLOW OF SAID AIR, AN AIR OUTLET OF A RECTANGULAR CONFIGURATION FORMING A DISCHARGE OPENING OF SAID PLENUM CHAMBER, MEANS FORMING A DOWNWARDLY EXTENDING, DIVERGING CHAMBER CONNECTING SAID DISCHARGE OPENING WITH THE INTERIOR OF SAID PLENUM CHAMBER, MEANS EXTENDING TRANSVERSELY OF THE CROSS SECTION OF SAID
Claim 2
Independent Claim
133 words
AN APPARATUS FOR PRODUCING AN AIR CURTAIN OF SUBSTANTIALLY UNIFORM DENSITY AND AIR FLOW RATE WHICH IS DIRECTED ACROSS A DOORWAY IN SUBSTANTIALLY THE SAME OUTLINE AS SAID DOORWAY, COMPRISING: A ROTATABLE PUMP HAVING AN INLET FOR GENERATING A SUBSTANTIALLY CONTINUOUS SUPERATMOSPHERIC PRESSURE OUTFLOW OF AIR, A VOLUTE CROSS SECTION PLENUM CHAMBER WHICH IS PRESSURIZED TO ABOVE ATMOSPHERIC PRESSURE BY SAID PUMP, MEANS FOR MOUNTING SAID PUMP INTERNALLY OF SAID PLENUM CHAMBER, SAID MOUNTING MEANS BEING DISPOSED AT A LOCATION WHICH IS IN NONINTERFERRING POSITION WITH THE FLOW OF SAID AIR, AN AIR OUTLET OF A RECTANGULAR CONFIGURATION FORMING A DISCHARGE OPENING OF SAID PLENUM CHAMBER, MEANS FORMING A DOWNWARDLY EXTENDING, DIVERGING CHAMBER CONNECTING SAID DISCHARGE OPENING WITH THE INTERIOR OF SAID PLENUM CHAMBER, MEANS EXTENDING TRANSVERSELY OF THE CROSS SECTION OF SAID
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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |