US2202339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating device
Assignee: DOREN VAN
•
Filing: 1939-03-03
•
Granted: 1940-05-28
•
Expires: 1959-03-03
Abstract
No abstract record available.
Inventors
- 👤 Walter H Dresser
- 👤 Wilbur E Van Doren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:44
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/02; F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/062; F24F13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-05-28 | 1943-11-27 | 1944-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-28 | 1947-11-27 | 1948-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-28 | 1951-11-27 | 1952-05-28 | $7700.00 | Window Closed / Lapsed |