US3301162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air curtain doorway method and system
Assignee: Individual
•
Filing: 1966-04-12
•
Granted: 1967-01-31
•
Expires: 1986-04-12
Abstract
No abstract record available.
Inventors
- 👤 William A Zumbiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:42
CPC Classifications
F; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
THE METHOD OF ESTABLISHING AND MAINTAINING AN AIR CURTAIN DOOR ACROSS AN EXTERIOR DOORWAY WHICH COMPRISES PROPELLING AIR FROM A CIRCULATING SYSTEM THROUGH AN AIR OUTLET ON ONE SIDE OF SAID DOORWAY TOWARD AN AIR INLET ON THE OPPOSITE SIDE OF SAID DOORWAY, SIMULTANEOUSLY DRAWING AIR THROUGH SAID AIR INLET INTO SAID CIRCULATING SYSTEM WHEREBY A HIGH VELOCITY STREAM OF AIR IN THE FORM OF AN AIR CURTAIN IS MAINTAINED ACROSS SAID DOORWAY, THE IMPROVEMENT WHICH COMPRISES REDUCING THE VELOCITY OF SAID HIGH VELOCITY STREAM OF AIR BY APPROXIMATELY 60 PERCENT UPON APPROACH OF A PERSON TO SAID DOORWAY WHEREBY SAID AIR CURTAIN IS MAINTAINED INTACT AT THE REDUCED VELOCITY WHILE THE PERSON PASSES THROUGH SAID DOORWAY.
References Cited (Backward Citations)
GB481991A
Cited
US2863373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |