US2704504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound trap and air transfer device
Assignee: Individual
•
Filing: 1950-02-02
•
Granted: 1955-03-22
•
Expires: 1970-02-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur O Wilkening
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:40
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/02; F; F24; F24F; F24F13/00; F24F13/24; Y; Y10; Y10S; Y10S454/00; Y10S454/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2328761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |