US4403045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali metal borohydride concentrate
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1982-12-29
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Granted: 1983-09-06
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Expires: 2002-12-29
Abstract
Abstract Alkali metal borohydride concentrates are prepared by dry blending alkali metal borohydride powder with a dry non-reactive plastic resin, melting and extruding the blended mixture to form an encapsulated alkali metal borohydride concentrate, and then chopping the extrusion into pellets. The pellet concentrate may then be blended into other materials.
Inventors
- 👤 Robert C. Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/065; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/16; Y10S264/83; Y10S521/00; Y10S521/909
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A method for making a cellular resinous article comprising: contacting alkali metal borohydride and a resinous polymer with an effective amount of a finely divided high surface area silica activating agent having a surface pH of less than 7 and having a proton source adsorbed on its surface so as to cause said alkali metal borohydride to hydrolyze, thereby creating foam and thereby causing said resinous polymer to have a cellular structure, said hydrolyzing occurring while the resinous polymer is in the molten condition.
Claim 2
Independent Claim
84 words
A method for making a cellular resinous article comprising: contacting alkali metal borohydride and a resinous polymer with an effective amount of a finely divided high surface area silica activating agent having a surface pH of less than 7 and having a proton source adsorbed on its surface so as to cause said alkali metal borohydride to hydrolyze, thereby creating foam and thereby causing said resinous polymer to have a cellular structure, said hydrolyzing occurring while the resinous polymer is in the molten condition.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein: said alkali metal borohydride is a memeber selected from the group consisting of sodium borohydride or potassium borohydride.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein: said alkali metal borohydride is in a powdered form.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein: said proton source is selected from a member of the group consisting of water, mineral acid, carboxylic acids, alcohol, sulfonic acids, polyacrylic acid, or polystyrene sulfonic acid.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein: said alkali metal borohydride is sodium borohydride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |