US3661994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft polymers of rubber for reinforcing plastics
Assignee: Stauffer Chemical Co
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Filing: 1969-11-14
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Granted: 1972-05-09
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Expires: 1989-11-14
Abstract
Abstract CONTROLLED EMULSION POLYMERIZATION PROVIDES MULTILAYERED PARTICLES COMPRISING A HARD POLYMERIC CORE, A COATING OF RUBBER AND, IF DESIRED, ONE OR MORE HARD OUTER POLYMERIC COATING. THESE RUBBER-CONTAINING "SANDWICH" POLYMER PARTICLES ARE USEFUL PARTICULARLY AS HIGH IMPACT PLASTICS AND MODIFIERS TO REINFORCE RELATIVELY RIGID TYPES OF PLASTICS. D R A W I N G
Inventors
- 👤 Jesse C H Hwa
- 👤 Ruth E Gallagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:27
CPC Classifications
C; C08; C08F; C08F285/00; Y; Y10; Y10S; Y10S525/00; Y10S525/902
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 |