US3661866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength polystyrene
Assignee: Kimberly Clark Corp
•
Filing: 1970-05-11
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Granted: 1972-05-09
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Expires: 1990-05-11
Abstract
Abstract POLYSTYRENE OF INCREASED STRENGTH AND RESISTANCE TO THERMAL DEGRADATION IS PRODUCED BY REACTION WITH MALEIC ANHYDRIDE AND A FREE RADICAL FORMER AT ELEVATED TEMPERATURES.
Inventors
- 👤 Eckhard C A Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:31
CPC Classifications
C; C08; C08F; C08F257/00; C08F257/02
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |