US2556470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat insulating structural panel
Assignee: Douglas Aircraft Co Inc
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Filing: 1947-11-22
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Granted: 1951-06-12
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Expires: 1967-11-22
Abstract
No abstract record available.
Inventors
- 👤 Mar Bruce E Del
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/08; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/78; E04B1/80; E04B1/806; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; Y; Y10; Y10S; Y10S220/00; Y10S220/14; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |