US3438330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppression means
Assignee: Waterous Co
•
Filing: 1965-10-20
•
Granted: 1969-04-15
•
Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 Louis B Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:59
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D29/2277
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR653243A
Cited
GB308442A
Cited
US1946212A
Cited
DE697592C
Cited
US2335284A
Cited
US2466812A
Cited
FR972528A
Cited
GB735866A
Cited
DE924068C
Cited
FR1130511A
Cited
US2921533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |