US3649731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reinforcing foam sheets
Assignee: Hercules LLC
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Filing: 1969-04-30
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Granted: 1972-03-14
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Expires: 1989-04-30
Abstract
Abstract WITH FIBROUS MATERIAL AND THEN COLLAPSING THE TUBE TO MAKE A SINGLE INTEGRAL LAMINATED SHEET. REINFORCED FOAM SHEETS CAN BE PREPARED BY FORCING, SUCH AS EXTRUDING, A FOAMABLE THERMOPLASTIC POLYMER COMPOSITION THROUGH AN ANNULAR DIE, FOAMING IN THE FORM OF A TUBE AT THE DIE FACE, LINING THE SIDE OF THE TUBE
Inventors
- 👤 Edward W Cronin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:51
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C70/00; B29C70/04; B29C70/06; B29C70/10; C; C08; C08J; C08J9/00; C08J9/0085; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08K9/00; C08K9/08; B29K; B29K2105/00; B29K2105/06; B29L; B29L2023/00
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |