US3361689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes by reaction of 1, 2-bis(difluoramino) ethyl isocyanate with polyvinyl alcohol or nitrocellulose
Assignee: EIDP Inc
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Filing: 1961-08-22
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Granted: 1968-01-02
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Expires: 1981-08-22
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Miegel
- 👤 Edmond J Nolan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:40
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR PREPARING SUBSTANTIALLY SPHERICAL PARTICLES OF POLYURETHANES CONTAINING AT LEAST TWO -OCONHCH(NF2ECH2NF2 RADICALS PENDENT FROM THE POLYMER BACKBONE STRUCTURE OF A POLYMERIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF NITROCELLULOSE AND POLYVINYL ALCOHOL WHICH COMPRISES DISSOLVING FIBROUS POLYURETHANE HAVING THE AFORESAID CHEMICAL COMPOSITION IN AN INERT ORGANIC SOLVENT, DISPERSING THE POLYURETHANE SOLUTION IN WATER IN THE PRESENCE OF A SURFACE-MODIFYING MATERIAL SELECTED FROM THE GROUP CONSISTING OF INERT COLLOIDING AGENTS, INERT EMULSIFYING AGENTS, AND MIXTURES THEREOF UNDER AGITATION WHEREBY DISPERSED POLYURETHANE PARTICLES ARE FORMED, AND REMOVING SAID ORGANIC SOLVENT FROM SAID PARTICLES.
Claim 2
Dependent Claim
94 words
A PROCESS FOR PREPARING SUBSTANTIALLY SPHERICAL PARTICLES OF POLYURETHANES CONTAINING AT LEAST TWO -OCONHCH(NF2ECH2NF2 RADICALS PENDENT FROM THE POLYMER BACKBONE STRUCTURE OF A POLYMERIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF NITROCELLULOSE AND POLYVINYL ALCOHOL WHICH COMPRISES DISSOLVING FIBROUS POLYURETHANE HAVING THE AFORESAID CHEMICAL COMPOSITION IN AN INERT ORGANIC SOLVENT, DISPERSING THE POLYURETHANE SOLUTION IN WATER IN THE PRESENCE OF A SURFACE-MODIFYING MATERIAL SELECTED FROM THE GROUP CONSISTING OF INERT COLLOIDING AGENTS, INERT EMULSIFYING AGENTS, AND MIXTURES THEREOF UNDER AGITATION WHEREBY DISPERSED POLYURETHANE PARTICLES ARE FORMED, AND REMOVING SAID ORGANIC SOLVENT FROM SAID PARTICLES.
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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |