Patent US4399238A successfully refreshed from Google Patents.
US4399238A
Expired / Lapsed
US
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Alkali metal borohydride concentrate
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1982-11-12
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Granted: 1983-08-16
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Expires: 2002-11-12
Abstract
Abstract Alkali metal borohydride concentrates are prepared by dry blending alkali metal borohydride power 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 19:21
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
64 words
A solid, substantially inert, and stable borohydride blowing agent concentrate mixture 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% absorbed water, balance essentially said dry inert resinous polymer.
Claim 2
Dependent Claim
64 words
A solid, substantially inert, and stable borohydride blowing agent concentrate mixture 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% absorbed water, balance essentially said dry inert resinous polymer.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein: said alkali metal borohydride is included from about 2% to 10% by weight.
Claim 4
Dependent Claim
24 words
The composition 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 composition 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 composition of claim 1 wherein: said alkali metal borohydroxide is sodium borohydride.
References Cited (Backward Citations)
US2758980A
Cited
US2909493A
Cited
US2945828A
Cited
US2930771A
Cited
US2951819A
Cited
US3167520A
Cited
US3331790A
Cited
US3511788A
Cited
US3393260A
Cited
US4183822A
Cited
US4097425A
Cited
US4278769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |