Patent US3854981A successfully refreshed from Google Patents.
US3854981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for embedding or enveloping solid materials
Assignee: Bayer AG
•
Filing: 1972-02-09
•
Granted: 1974-12-17
•
Expires: 1992-02-09
Abstract
Abstract Solids or liquids are embedded or enveloped in a carboxylpolymer by dispersing or dissolving the solid or liquid in an aqueous solution of the polymer and introducing the resulting solution or dispersion into a solution of an aluminium salt.
Inventors
- 👤 G Pampus
- 👤 N Schon
- 👤 H Schnoring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:08
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B01J2/00; B01J2/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
PROCESS FOR EMBEDDING OR ENVELOPING A SOLID OR LIQUID IN A POLYMER CONTAINING CARBOXY OR CARBOXYLATE GROUPS, SAID PROCESS COMPRISING DISPERSING OR DISSOLVING SAID SOLID OR LIQUID IN AN AQUEOUS SOLUTION OF SAID POLYMER, ATOMIZING THE RESULTING DISPERSION OR SOLUTION TO THEREBY FORM SMALL SPHERICAL PARTICLES THEREOF AND INTRODUCING SAID ATOMIZED PARTICLES INTO AN AQUEOUS SOLUTION OF AN ALUMINUM SALT TO THEREBY CROSSLINK SAID POLYMER AND FORM SOLID EVELOPES ABOUT SAID PARTICLES AND RECOVERING RESULTING PARTICLES S A MICROGRANULATE.
Claim 2
Dependent Claim
79 words
PROCESS FOR EMBEDDING OR ENVELOPING A SOLID OR LIQUID IN A POLYMER CONTAINING CARBOXY OR CARBOXYLATE GROUPS, SAID PROCESS COMPRISING DISPERSING OR DISSOLVING SAID SOLID OR LIQUID IN AN AQUEOUS SOLUTION OF SAID POLYMER, ATOMIZING THE RESULTING DISPERSION OR SOLUTION TO THEREBY FORM SMALL SPHERICAL PARTICLES THEREOF AND INTRODUCING SAID ATOMIZED PARTICLES INTO AN AQUEOUS SOLUTION OF AN ALUMINUM SALT TO THEREBY CROSSLINK SAID POLYMER AND FORM SOLID EVELOPES ABOUT SAID PARTICLES AND RECOVERING RESULTING PARTICLES S A MICROGRANULATE.
Claim 3
Dependent Claim
26 words
Process according to claim 1 wherein said solid or liquid is a pharmaceutical, a plant protective agent, a spice, a dyestuff, an oil or an adhesive.
Claim 4
Dependent Claim
18 words
Process according to claim 1 wherein said liquid is a solution of a solid in a water-immiscible solvent.
Claim 5
Dependent Claim
36 words
Process according to claim 1 wherein said solid or liquid is present in an amount of from 99 to 5 percent by weight based on the dry of the mixture of solid or liquid and polymer.
Claim 6
Dependent Claim
29 words
Process according to claim 1 wherein said polymer has a molecular weight corresponding at least to a viscosity of 10 centipoise at 25* C in 2 percent aqueous solution.
Claim 7
Dependent Claim
21 words
Process according to claim 1 wherein the aqueous polymer solution has a concentration of from 0.05 to 5 percent by weight.
Claim 8
Dependent Claim
27 words
Process according to claim 1 wherein the polymer is a synthetic or natural high molecular weight polycarboxylic acid, its alkali metal salt, ammonium salt or amine salt.
Claim 9
Dependent Claim
21 words
Process according to claim 1 wherein said aqueous solution of an aluminium salt has a concentration of 0.01 to 3 mols/litre.
References Cited (Backward Citations)
US2431211A
Cited
US2657155A
Cited
US2599771A
Cited
US3257229A
Cited
US3276901A
Cited
US3269855A
Cited
US3748277A
Cited
US3544500A
Cited
US3549555A
Cited
US3691090A
Cited
US3640741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |