US2047775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum muffler
Assignee: Walker Manufacturing Co
•
Filing: 1933-09-01
•
Granted: 1936-07-14
•
Expires: 1953-09-01
Abstract
No abstract record available.
Inventors
- 👤 Earl G Gunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:18
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/16; F01N1/166; F01N1/003; F01N1/08; F01N1/086; F01N1/088; F01N5/00; F01N5/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1939-07-14 | 1940-01-13 | 1940-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-07-14 | 1944-01-13 | 1944-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-07-14 | 1948-01-13 | 1948-07-14 | $7700.00 | Window Closed / Lapsed |