Patent US3389519A successfully refreshed from Google Patents.
US3389519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spaced foam core panels
Assignee: Fibreboard Paper Products Corp
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Filing: 1966-03-09
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Granted: 1968-06-25
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Expires: 1986-03-09
Abstract
No abstract record available.
Inventors
- 👤 David H Williams
- 👤 Ernest C Pellaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:59
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/284; E04C2/296; Y; Y10; Y10T; Y10T428/00; Y10T428/18; Y10T428/183; Y10T428/24; Y10T428/24174; Y10T428/24182; Y10T428/24273; Y10T428/24802; Y10T428/24826
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |