Patent US3894693A successfully refreshed from Google Patents.
US3894693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a flaky powder or bulky form particles of metallic aluminum
Assignee: Aikoh Co Ltd
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Filing: 1973-07-16
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Granted: 1975-07-15
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Expires: 1993-07-16
Abstract
Abstract A process is provided for the production of aluminum particles or powders in bulk form which comprises the steps of crushing paper backed aluminum foil (i.e., aluminum foil laminated paper) heating (i.e., burning or baking) the crushed paper backed laminated aluminum foil so as to separate and remove substances other than aluminum therefrom, and grinding the remaining aluminum foil.
Inventors
- 👤 Masaru Takashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:01
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/0056
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A PROCESS FOR THE PRODUCTION OF ALUMINUM POWDER IN FLAKE FORM COMPRISING THE STEPS OF CRUSHING ALUMINUM FOIL LAMINATED PAPER, HEATING SAID CRUSHED ALUMINUM FOIL LAMINATED PAPER UNDER SUBSTANTIALLY NON-OXIDIZING CONDITIONS WITH RESPECT TO SAID ALUMINUM FOIL TO CHAR THE LAMINATED PAPER, SEPARATING THE CHARRED PAPER FROM THE ALUMINIUM FOIL, AND GRINDING THE RESULTANT ALUMINUM FOIL, WHEREBY THE DESIRED ALUMINUM PARTICLES ARE OBTAINED.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE PRODUCTION OF ALUMINUM POWDER IN FLAKE FORM COMPRISING THE STEPS OF CRUSHING ALUMINUM FOIL LAMINATED PAPER, HEATING SAID CRUSHED ALUMINUM FOIL LAMINATED PAPER UNDER SUBSTANTIALLY NON-OXIDIZING CONDITIONS WITH RESPECT TO SAID ALUMINUM FOIL TO CHAR THE LAMINATED PAPER, SEPARATING THE CHARRED PAPER FROM THE ALUMINIUM FOIL, AND GRINDING THE RESULTANT ALUMINUM FOIL, WHEREBY THE DESIRED ALUMINUM PARTICLES ARE OBTAINED.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said heating results in the burning of said paper.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said heating results in the baking of said paper.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the heating is at a temperature in the range from 150* to 500*C.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the resultant mass of aluminum particles is then further ground and any remaining charred paper is separated and removed from the mass.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the resultant aluminum particles contains not less than 60% by weight of metallic aluminum.
Claim 8
Dependent Claim
70 words
A process for the production of particles of aluminum in bulk form which comprises the steps of crushing aluminum foil laminated papers, heating said crushed aluminum foil laminated paper under substantially non-oxidizing conditions with respect to said aluminum foil to char the laminated paper, separating the charred paper from the aluminum foil, grinding the resulting aluminum foil into small pieces, and aggregating said ground small pieces of the aluminum foil.
Claim 9
Dependent Claim
70 words
A process for the production of particles of aluminum in bulk form which comprises the steps of crushing aluminum foil laminated papers, heating said crushed aluminum foil laminated paper under substantially non-oxidizing conditions with respect to said aluminum foil to char the laminated paper, separating the charred paper from the aluminum foil, grinding the resulting aluminum foil into small pieces, and aggregating said ground small pieces of the aluminum foil.
Claim 10
Dependent Claim
19 words
The process of claim 7 wherein the heating is at a temperature in the range from 150* to 500*C.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |