US3715231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage of liquid hydrazine rocket fuels
Assignee: United States Department of the Army
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Filing: 1971-05-28
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Granted: 1973-02-06
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Expires: 1991-05-28
Abstract
Abstract Liquid hydrazine fuels are stored in maraging steel containers for rocket systems provided with a thin protective lining of a metal of the group consisting of cadmium, silver, aluminum, nickel, tungsten, tin and alloys of tin with cadmium, nickel, and lead whereby the rate of decomposition of the fuel is greatly retarded and the fuel can be safely stored for long periods.
Inventors
- 👤 W Lehman
- 👤 W Ng
- 👤 J Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
F; F17; F17C; F17C1/00; F17C1/10; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/05; F17C2201/056; F17C2203/00; F17C2203/06; F17C2203/0602; F17C2203/0604; F17C2203/0612; F17C2203/0614; F17C2203/0619; F17C2203/0634; F17C2203/0636; F17C2203/0639; F17C2203/0646; F17C2203/0648; F17C2209/00; F17C2209/23; F17C2209/232; F17C2221/00; F17C2221/08; F17C2223/00; F17C2223/01; F17C2223/0107; F17C2223/013; F17C2223/03; F17C2223/033; F17C2223/035; F17C2260/00; F17C2260/02; F17C2260/021; F17C2260/05; F17C2260/053; F17C2270/00; F17C2270/01; F17C2270/0165; F17C2270/0168; F17C2270/0171; F17C2270/0186; F17C2270/0197; Y; Y10; Y10S; Y10S220/00; Y10S220/901; Y10S220/917; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12701; Y10T428/12708; Y10T428/12722; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12778; Y10T428/12785; Y10T428/12861; Y10T428/12937; Y10T428/13
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A method for storing liquid hydrazine fuels, which comprises maintaining said fuel in a container wherein the container wall in contact with the fuel consists of maraging steel coated with a metal of the group consisting of cadmium, silver, tin, nickel, aluminum, tungsten and tin alloyed with a metal of the group consisting of cadmium, nickel or lead.
Claim 2
Independent Claim
58 words
A method for storing liquid hydrazine fuels, which comprises maintaining said fuel in a container wherein the container wall in contact with the fuel consists of maraging steel coated with a metal of the group consisting of cadmium, silver, tin, nickel, aluminum, tungsten and tin alloyed with a metal of the group consisting of cadmium, nickel or lead.
Claim 3
Dependent Claim
25 words
The method according to claim 1, wherein the fuel is selected from the group consisting of hydrazine, monomethyl hydrazine, 1, 1-dimethyl hydrazine and mixtures thereof.
Claim 4
Dependent Claim
21 words
The method according to claim 1, wherein the maraging steel contains 10-20 percent nickel, 7-9 percent cobalt and 2-5 percent molybdenum.
Claim 5
Dependent Claim
19 words
The method according to claim 1, wherein the fuel consists essentially of a mixture of hydrazine and monomethyl hydrazine.
Claim 6
Dependent Claim
18 words
The method according to claim 1, wherein the metal coating is about 1 to 10 mils in thickness.
Claim 7
Dependent Claim
11 words
The method according to claim 1, wherein the metal is cadmium.
Claim 8
Dependent Claim
12 words
The method according to claim 1 wherein the metal is electroless nickel.
Claim 9
Dependent Claim
19 words
The method according to claim 1, wherein the metal is coated on a nickel undercoat on the maraging steel.
Claim 10
Dependent Claim
60 words
In a rocket tankage system the improvement which comprises a container for storing liquid hydrazine fuels, wherein the container wall in contact with the fuel is composed of maraging steel coated with a metal of the group consisting of cadmium, silver, tin, nickel, aluminum, tungsten and tin alloyed with a metal of the group consisting of cadmium, nickel and lead.
Claim 11
Dependent Claim
60 words
In a rocket tankage system the improvement which comprises a container for storing liquid hydrazine fuels, wherein the container wall in contact with the fuel is composed of maraging steel coated with a metal of the group consisting of cadmium, silver, tin, nickel, aluminum, tungsten and tin alloyed with a metal of the group consisting of cadmium, nickel and lead.
Claim 12
Dependent Claim
14 words
A container according to claim 9 wherein the maraging steel is coated with cadmium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |