US3574161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polymeric compositions
Assignee: Dunlop Co Ltd
•
Filing: 1968-02-28
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Granted: 1971-04-06
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Expires: 1988-02-28
Abstract
Abstract METHOD OF PREPARING A SOLUTION OF A POLYMERIC MATERIAL IN AN ORGANIC SOLVENT WHICH COMPRISES MIXING (A) A DISPERSION OF POLYMERIC PARTICLES IN WATER, IN WHICH THE PARTICLES ARE DISPERSED WITH THE ASSITANCE OF AN IONIC DISPERSING AGENT, WITH (B) A DISPERSION OF THE ORGANIC SOLVENT IN WATER, IN WHICH THE SOLVENT HAS BEEN DISPERSED USING A HIGH DEGREE OF SHEAR WITH THE ASSISTANCE OF A DISPERSING AGENT OF OPPOSITE POLARITY TO THE FIRST MENTIONED DISPERSING AGENT, AND SEPARATING THE WATER LAYER THUS FORMED FROM THE ORGANIC SOLVENT LAYER CONTAINING THE POLYMERIC MATERIAL.
Inventors
- 👤 Robert P Campion
- 👤 James F Yardley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J2321/00; Y; Y10; Y10S; Y10S524/00; Y10S524/924
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |