US3720032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight panel construction
Assignee: Individual
•
Filing: 1970-08-17
•
Granted: 1973-03-13
•
Expires: 1990-08-17
Abstract
Abstract A LIGHT WEIGJHT RIGID PANEL CONSTRUCTION INCLUDING A PLASTIC CORE MEMBER HAVING A PLURALITY OF CONCENTRIC CORRUGATIONS, RIGID FRAME MEANS POSITIONED IN THEOUTERMOST OF THE CORRUGATIONS, TENSIONING MEANS CONNECTING DIAGONLLY OPPOSITE CORNERS OF THE CORE MEMBER, AND COVER MEANS ON EACH FACE OF THE CORE MEMBER.
Inventors
- 👤 J Harman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:52
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/3405; E04C2/38; E04C2/386; E04C2002/3444; E04C2002/3461; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |