US3787543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of low density microcellular foam sheets exhibiting high work-to-tear values
Assignee: Ametek Inc
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Filing: 1970-12-23
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Granted: 1974-01-22
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Expires: 1990-12-23
Abstract
Abstract A LOW DENSITY FOAM SHEET OF A HIGH WORK-TO-BREAK VALUE THERMOPLASTIC CRYSTALLINE POLYMER COMPRISING POLYHERDRAL SHAPED CLOSED CELLS HAVING A MEDIAN DIAMETER OF AT LEAST 500 MICRONS AND A PROCESS FOR ITS PREPARATION BY FLASH EXTRUSION WITH REDUCED BUBBLE NUCLEI FORMATION.
Inventors
- 👤 R Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |