Patent US3481427A successfully refreshed from Google Patents.
US3481427A
Expired / Lapsed
US
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Acoustical panel structure
Assignee: McDonnell Douglas Corp
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Filing: 1968-11-29
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Granted: 1969-12-02
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Expires: 1988-11-29
Abstract
No abstract record available.
Inventors
- 👤 Richard A Dobbs
- 👤 Richard N Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:17
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; F; F02; F02K; F02K1/00; F02K1/78; F02K1/82; F02K1/827; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3166149A
Cited
US2477852A
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US2607104A
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US3011584A
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US3090406A
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US3207185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |