US2852998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for diffusion of air in show halls for ventilation and air conditioning purposes
Assignee: Individual
•
Filing: 1955-04-05
•
Granted: 1958-09-23
•
Expires: 1975-04-05
Abstract
No abstract record available.
Inventors
- 👤 Serra Jose Llobet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:05
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F13/00; F24F13/02; F24F13/06; F24F13/0604; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR409707A
Cited
US1370832A
Cited
US1484566A
Cited
US1750873A
Cited
US1798266A
Cited
US2562959A
Cited
US2623448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |