US3230681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spline joint for expanded thermoplastic panels
Assignee: Dow Chemical Co
•
Filing: 1961-07-12
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Granted: 1966-01-25
•
Expires: 1981-07-12
Abstract
No abstract record available.
Inventors
- 👤 Garald F Allen
- 👤 Donald R Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:53
CPC Classifications
F; F25; F25D; F25D23/00; F25D23/06; F25D23/062; F25D23/063; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/205; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN A STRUCTURE COMPRISING A PLURALITY OF INTERFITTED PANELS HAVING JOINTS BETWEEN ADJACENT PANELS, SAID PANELS HAVING OPPOSED FACE SHEETS AND AN EXPANDED THERMOPLASTIC CORE, SAID JOINTS BETWEEN ADJACENT PANELS COMPRISING A SPLINE MEMBER INSERTED INTO A GROOVE IN ADJACENT CORES, THE IMPROVEMENT WHICH COMPRISES AN EXPANDED POLYSTYRENE SPLINE HAVING ON ITS SURFACE A THIN PLASTIC FILM, THE FILM HAVING A THICKNESS OF ABOUT 1 MIL.
Claim 2
Dependent Claim
66 words
IN A STRUCTURE COMPRISING A PLURALITY OF INTERFITTED PANELS HAVING JOINTS BETWEEN ADJACENT PANELS, SAID PANELS HAVING OPPOSED FACE SHEETS AND AN EXPANDED THERMOPLASTIC CORE, SAID JOINTS BETWEEN ADJACENT PANELS COMPRISING A SPLINE MEMBER INSERTED INTO A GROOVE IN ADJACENT CORES, THE IMPROVEMENT WHICH COMPRISES AN EXPANDED POLYSTYRENE SPLINE HAVING ON ITS SURFACE A THIN PLASTIC FILM, THE FILM HAVING A THICKNESS OF ABOUT 1 MIL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |