US2706442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilated wall
Assignee: Individual
•
Filing: 1952-09-19
•
Granted: 1955-04-19
•
Expires: 1972-09-19
Abstract
No abstract record available.
Inventors
- 👤 Douglas S Risley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:13
CPC Classifications
F; F24; F24F; F24F7/00; E; E04; E04B; E04B1/00; E04B1/62; E04B1/70; E04B1/7069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US70792A
Cited
US1539611A
Cited
US1745765A
Cited
US1968680A
Cited
US2013367A
Cited
GB530632A
Cited
GB545005A
Cited
US2475028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |