US2920357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling with controlled ventilation
Assignee: Individual
•
Filing: 1956-04-26
•
Granted: 1960-01-12
•
Expires: 1976-04-26
Abstract
No abstract record available.
Inventors
- 👤 Walter M Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:11
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/06; E04B9/065; E04B9/02; E04B9/12; E04B9/127; E04B9/30; F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/072
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
BE522923A
Cited
US1561755A
Cited
US2221001A
Cited
US2307653A
Cited
US2340911A
Cited
US2676679A
Cited
US2710679A
Cited
US2689630A
Cited
US2708869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |