US3929980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing hydrogen
Assignee: United States Department of Energy
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Filing: 1974-12-26
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Granted: 1975-12-30
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Expires: 1994-12-26
Abstract
Abstract Water is thermochemically decomposed to produce hydrogen by the following sequence of reactions. KNO3 and I2 are reacted to produce KI, NO and O2, the NO and O2 thus produced are reacted with water to form HNO3, a hydrogen-containing iodide - NH4I or HI - is formed from the HNO3, and this iodide is thermally decomposed to produce hydrogen, all products of the reactions being recycled except hydrogen and oxygen.
Inventors
- 👤 Bernard M Abraham
- 👤 Felix Schreiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:20
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0203; C01B3/00; C01B3/02; C01B3/06; C01B3/103; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A METHOD FOR DECOMPOSING WATER CHEMICALLY COMPRISING REACTING MOLTEN KNO3 AND VAPOROUS I2 TO FORM NO, O2 AND CRYSTALLINE KI, REACTING THE NO AND ONE HALF OF THE O2 THUS FORMED WITH WATER TO FORM HNO3, FORMING NH4I BY REACTING THIS HNO3 WITH NH3 TO FORM NH4NO3 AND REACTING THIS NH4NO3 WITH THE KI PRODUCED IN THE FIRST STEP ABOVE RECITED, DECOMPOSING THE NH4I TO OBTAIN HYDROGEN, AND RECYCLING ALL COMPOUND PRODUCED IN THIS SERIES OF REACTIONS EXCEPT HYDROGEN AND ONEHALF OF THE OXYGEN PRODUCED IN THE FIRST-RECITED STEP, THE NET EFFECT OF THE TOTAL PROCESS THUS COMPRISING THE DECOMPOSITION OF WATER.
Claim 2
Independent Claim
102 words
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
Claim 3
Dependent Claim
68 words
A method for decomposing water chemically according to claim 1 wherein the series of reactions employed follows: 2 KNO3 + I2 -> 2 KI + 2 NO + 2 O2 2 NO + 3/2 O2 + H2O -> 2 HNO3 2 HNO3 + 2 NH3 -> 2 NH4NO3 2 KI + 2 NH4NO3 -> 2 KNO3 + 2 NH4I 2 NH4I -> 2 NH3 + I2 + H2.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |