US3457850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air curtain ventilator
Assignee: Elster S Air Conditioning
•
Filing: 1967-12-11
•
Granted: 1969-07-29
•
Expires: 1987-12-11
Abstract
No abstract record available.
Inventors
- 👤 Albert Sweet
- 👤 Arnold S Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:23
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; F24C15/2028; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 0
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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) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |