US2565122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating wall block
Assignee: AIR RECTIFIERS Inc
•
Filing: 1947-03-19
•
Granted: 1951-08-21
•
Expires: 1967-03-19
Abstract
No abstract record available.
Inventors
- 👤 Cowan Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
F; F24; F24F; F24F7/00; E; E04; E04C; E04C1/00; E04C1/42; F24F13/00; F24F13/08; F24F13/082
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US104486A
Cited
US1705418A
Cited
US872979A
Cited
US1204321A
Cited
GB161314A
Cited
US1493875A
Cited
US1816769A
Cited
GB405785A
Cited
US2092673A
Cited
US2132263A
Cited
US2273758A
Cited
US2390394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |