US3069991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling with controlled ventilation
Assignee: AIRSON Co Inc
•
Filing: 1959-03-30
•
Granted: 1962-12-25
•
Expires: 1979-03-30
Abstract
No abstract record available.
Inventors
- 👤 Walter M Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:50
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/02; E04B9/30; F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US781538A
Cited
US1826133A
Cited
US2251683A
Cited
US2180945A
Cited
US2221001A
Cited
US2251682A
Cited
US2859681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |