Patent US3173878A successfully refreshed from Google Patents.
US3173878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making microcapsules
Assignee: International Business Machines Corp
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Filing: 1960-02-26
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Granted: 1965-03-16
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Expires: 1980-02-26
Abstract
No abstract record available.
Inventors
- 👤 Reyes Zoila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:46
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A PROCESS OF PRODUCING POLYMERIC MICROCAPSULES CONTAINING AQUEOUS SOLUTION, THE STEPS OF DISPERSING SUCH SOLUTION IN A NONAQUEOUS NONPOLAR SOLVENT LIQUID CONTAINING DISSOLVED HYDROPHOBIC POLYMERIZED MATERIAL, ADDING A NONAQUEOUS NONPOLAR LIQUID IN WHICH SAID POLYMERIZED MATERIAL IS INSOLUBLE, SAID LAST NAMED STEP CAUSING SAID POLYMERIZED MATERIAL TO INSOLUBILIZE AND PRECIPITATE ABOUT DISPERSED DROPLETS OF AQUEOUS SOLUTION TO FORM POLYMERIC MICROCAPSULES, AND GRADUALLY INSOLUBILIZING AND HARDENING SAID MICROCAPSULES BY SUCCESSIVE WASHINGS WITH MIXTURES OF SAID NONAQUEOUS NONPOLAR SOLVENT AND NONAQUEOUS NONPOLAR INSOLUBILIZING LIQUID DECREASING IN SOLVENT CAPACITY WITH RESPECT TO SAID POLYMERIZED MATERIAL.
Claim 2
Dependent Claim
93 words
IN A PROCESS OF PRODUCING POLYMERIC MICROCAPSULES CONTAINING AQUEOUS SOLUTION, THE STEPS OF DISPERSING SUCH SOLUTION IN A NONAQUEOUS NONPOLAR SOLVENT LIQUID CONTAINING DISSOLVED HYDROPHOBIC POLYMERIZED MATERIAL, ADDING A NONAQUEOUS NONPOLAR LIQUID IN WHICH SAID POLYMERIZED MATERIAL IS INSOLUBLE, SAID LAST NAMED STEP CAUSING SAID POLYMERIZED MATERIAL TO INSOLUBILIZE AND PRECIPITATE ABOUT DISPERSED DROPLETS OF AQUEOUS SOLUTION TO FORM POLYMERIC MICROCAPSULES, AND GRADUALLY INSOLUBILIZING AND HARDENING SAID MICROCAPSULES BY SUCCESSIVE WASHINGS WITH MIXTURES OF SAID NONAQUEOUS NONPOLAR SOLVENT AND NONAQUEOUS NONPOLAR INSOLUBILIZING LIQUID DECREASING IN SOLVENT CAPACITY WITH RESPECT TO SAID POLYMERIZED MATERIAL.
References Cited (Backward Citations)
US2800458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |