US4080210A
Expired / Lapsed
US
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Method and apparatus for preparing uniformly-sized fine particles
Assignee: Shoei Chemical Inc
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Filing: 1975-12-08
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Granted: 1978-03-21
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Expires: 1995-12-08
Abstract
Abstract A method and apparatus for preparing uniformly-sized particles wherein a first liquid reactant is chemically reacted with a second liquid reactant to form precipitated particles of substantially uniform particle size which comprises forming substantially uniformly-sized droplets of one of said reactants and directing said droplets against the falling flow of the other of said reactants.
Inventors
- 👤 Eiichi Asada
- 👤 Hiromu Sasaki
- 👤 Toshio Matsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:17
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/34; B; B01; B01F; B01F25/00; B01F25/70; B01F25/74; B01J; B01J2/00; B01J2/02; B01J2/06; C01G; C01G5/00; G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70647; G11B5/70652; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/60; C01P2004/62; G03C1/035; G03C2001/03594; G03C2200/00; G03C2200/09
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A method of preparing uniformly-sized particles of silver oxide wherein a first solution of a soluble silver salt is chemically reacted with a second solution of a soluble hydroxide to form precipitated particles of silver oxide of substantially uniform particle size which comprises forming substantially uniformly-sized droplets of said first solution and directing said droplets against a uniform falling flow of said second solution.
Claim 2
Independent Claim
64 words
A method of preparing uniformly-sized particles of silver oxide wherein a first solution of a soluble silver salt is chemically reacted with a second solution of a soluble hydroxide to form precipitated particles of silver oxide of substantially uniform particle size which comprises forming substantially uniformly-sized droplets of said first solution and directing said droplets against a uniform falling flow of said second solution.
Claim 3
Dependent Claim
17 words
The method of claim 1, wherein the droplets of said first solution are produced by centrifugal action.
Claim 4
Dependent Claim
21 words
The method of claim 2, wherein the particles of said silver oxide have a size of about 0.3 to 0.6 μm.
Claim 5
Dependent Claim
52 words
The method of claim 1, wherein said first solution of soluble silver salt is an aqueous solution of silver nitrate and said second solution of soluble hydroxide is selected from at least one member of the group consisting of an aqueous solution of sodium hydroxide and an aqueous solution of potassium hydroxide.
Claim 6
Dependent Claim
21 words
The method of claim 4, wherein the particles of said silver oxide have a size of about 0.3 to 0.6 μm.
Claim 7
Independent Claim
104 words
A method of preparing uniformly-sized particles of silver oxide wherein a first solution of a soluble silver sale is chemically reacted with a second solution of a soluble hydroxide to form precipitated particles of silver oxide of substantially uniform particle size which comprises introducing a substantially uniform flow of said second solution along the inside surface of a container and introducing said first solution into a rotating receptacle centrally disposed within said container, said rotating receptacle ejecting uniformly-sized droplets of said first solution by centrifugal action into contact with the falling flow of said second solution flowing along the inside surface of said container.
Claim 8
Independent Claim
104 words
A method of preparing uniformly-sized particles of silver oxide wherein a first solution of a soluble silver sale is chemically reacted with a second solution of a soluble hydroxide to form precipitated particles of silver oxide of substantially uniform particle size which comprises introducing a substantially uniform flow of said second solution along the inside surface of a container and introducing said first solution into a rotating receptacle centrally disposed within said container, said rotating receptacle ejecting uniformly-sized droplets of said first solution by centrifugal action into contact with the falling flow of said second solution flowing along the inside surface of said container.
Claim 9
Dependent Claim
21 words
The method of claim 6, wherein the rotation of said receptacle ejects said first solution in droplets of substantially uniform size.
Claim 10
Dependent Claim
54 words
The method of claim 7, wherein said first solution of a soluble silver salt is an aqueous solution of silver nitrate and a second solution of a soluble hydroxide is selected from at least one member of the group consisting of an aqueous solution of sodium hydroxide and an aqueous solution of potassium hydroxide.
References Cited (Backward Citations)
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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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |