US3439774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound energy absorbing apparatus
Assignee: Boeing Co
•
Filing: 1966-01-21
•
Granted: 1969-04-22
•
Expires: 1986-01-21
Abstract
No abstract record available.
Inventors
- 👤 Vernon E Callaway
- 👤 Leonard S Goralski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:30
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/78; F02K1/82; F02K1/827; G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB829012A
Cited
US2934891A
Cited
US3113634A
Cited
US3286787A
Cited
US3263771A
Cited
US3286786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |