Patent US4394458A successfully refreshed from Google Patents.
US4394458A
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: 1983-07-19
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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 11:02
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
103 words
A method of making a solid, substantially inert, and stable alkali metal borohydride blowing agent concentrate, comprising: a. dry blending from 0.5% to 20% by weight of dried alkali metal borohydride with a dried inert resinous polymer in which reactive protonic hydrogen atoms are substantially absent to form a mixture thereof containing less than about 0.1% by weight adsorbed water; b. heating said mixture to a temperature above the melting point of said resin to form a molten mixture; c. extruding said molten mixture to form a solid, stable and substantially inert concentrate; and d. forming said extruded and cooled concentrate into pellets.
Claim 2
Independent Claim
103 words
A method of making a solid, substantially inert, and stable alkali metal borohydride blowing agent concentrate, comprising: a. dry blending from 0.5% to 20% by weight of dried alkali metal borohydride with a dried inert resinous polymer in which reactive protonic hydrogen atoms are substantially absent to form a mixture thereof containing less than about 0.1% by weight adsorbed water; b. heating said mixture to a temperature above the melting point of said resin to form a molten mixture; c. extruding said molten mixture to form a solid, stable and substantially inert concentrate; and d. forming said extruded and cooled concentrate into pellets.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein: said dry blended mixture contains from about 2% to 10% by weight of said alkali metal borohydride.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein: said alkali metal borohydride is a member selected from the group consisting of sodium borohydride or potassium borohydride.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein: said inert resinous polymer is a member selected from the group consisting of polyolefins, polydienes, polystyrene, polyphenylene oxide-styrene, polyacrylates, polyvinylchloride, or polyvinylacetate.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |