Patent US4397948A successfully refreshed from Google Patents.
US4397948A
Expired / Lapsed
US
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Alkali metal borohydride concentrate
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1982-07-14
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Granted: 1983-08-09
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Expires: 2002-07-14
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
2026-11-03 06:48
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
120 words
A method of making a cellular article, comprising mixing a solid, substantially inert, and stable borohydride blowing agent concentrate prepared from a dried alkali metal borohydride and a dried inert resinous polymer in which reactive protonic hydrogen atoms are substantially absent; said concentrate mixture consisting essentially of from about 0.5% to 20% by weight of said alkali metal borohydride, less than about 0.1% adsorbed water, balance essentially said dry inert resinous polymer with a resinous polymer and an effective amount of an activating agent capable of donating a proton to said alkali metal borohydride so as to hydrolyze said alkali metal borohydride and thereby form a cellular article; said hydrolyzing occurring while said resinous polymer is in the molten condition.
Claim 2
Independent Claim
120 words
A method of making a cellular article, comprising mixing a solid, substantially inert, and stable borohydride blowing agent concentrate prepared from a dried alkali metal borohydride and a dried inert resinous polymer in which reactive protonic hydrogen atoms are substantially absent; said concentrate mixture consisting essentially of from about 0.5% to 20% by weight of said alkali metal borohydride, less than about 0.1% adsorbed water, balance essentially said dry inert resinous polymer with a resinous polymer and an effective amount of an activating agent capable of donating a proton to said alkali metal borohydride so as to hydrolyze said alkali metal borohydride and thereby form a cellular article; said hydrolyzing occurring while said resinous polymer is in the molten condition.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein: said activating agent comprises a finely divided high surface area solid having a proton source adsorbed on its surface.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein: said finely divided high surface area solid comprises silica.
Claim 5
Dependent Claim
32 words
The method of claim 3 wherein: said proton source is a member selected from 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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |