Patent US2840430A successfully refreshed from Google Patents.
US2840430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel construction having a cellular core
Assignee: NAT PLASTIC PRODUCTS Co
•
Filing: 1952-11-28
•
Granted: 1958-06-24
•
Expires: 1972-11-28
Abstract
No abstract record available.
Inventors
- 👤 Winer Ephraim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:20
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB429301A
Cited
US2096908A
Cited
US2297072A
Cited
US2477852A
Cited
US2444183A
Cited
US2630604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |