US2663765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppression device
Assignee: Phillips Petroleum Co
•
Filing: 1949-03-07
•
Granted: 1953-12-22
•
Expires: 1969-03-07
Abstract
No abstract record available.
Inventors
- 👤 Boisblanc Deslonde R De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:11
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/16; H03G5/18; H03G5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2101525A
Cited
US2084135A
Cited
US2167462A
Cited
US2143407A
Cited
US2338410A
Cited
US2449971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |