Patent US2794935A successfully refreshed from Google Patents.
Patent US2611310A successfully refreshed from Google Patents.
US2611310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating wall block
Assignee: AIR RECTIFIERS Inc
•
Filing: 1947-05-27
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Granted: 1952-09-23
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Expires: 1967-05-27
Abstract
No abstract record available.
Inventors
- 👤 Cowan Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:00
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/42
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |