US4368274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing aluminum from polyethylene teraphthalate (PET) bottle scrap
Assignee: EIDP Inc
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Filing: 1981-11-20
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Granted: 1983-01-11
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Expires: 2001-11-20
Abstract
Abstract A method for removing aluminum from PET bottle scrap flakes comprises: (1) mixing the scrap flakes with a solution containing a chemical that reacts with aluminum such that the aluminum in the scrap will completely dissolve into the solution; then (2) decanting off the solution with the aluminum dissolved in it, so as to leave behind PET flake; and finally (3) washing the PET flake.
Inventors
- 👤 Paul T. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:38
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/02; B08; B08B; B08B3/00; B08B3/04; B08B3/08; C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C22; C22B; C22B21/00; C22B21/0015; C22B21/0023; B29B17/04; B29B17/0412; B29B2017/0213; B29B2017/0293; B29K; B29K2067/00; B29K2705/00; B29K2705/02; C08J2367/00; C08J2367/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S264/00; Y10S264/911; Y10S264/918
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
In a method for removing aluminum from PET bottle scrap flakes, the improvement which comprises: (a) mixing the scrap flakes with a solution containing a chemical that reacts with aluminum, the chemical being at a sufficient concentration and in contact with the scrap at a sufficient temperature and for a sufficient time to completely dissolve the aluminum in the scrap into the solution; then (b) decanting off the solution with the aluminum dissolved in it, so as to leave behind PET flake; and finally (c) washing the PET flake.
Claim 2
Dependent Claim
89 words
In a method for removing aluminum from PET bottle scrap flakes, the improvement which comprises: (a) mixing the scrap flakes with a solution containing a chemical that reacts with aluminum, the chemical being at a sufficient concentration and in contact with the scrap at a sufficient temperature and for a sufficient time to completely dissolve the aluminum in the scrap into the solution; then (b) decanting off the solution with the aluminum dissolved in it, so as to leave behind PET flake; and finally (c) washing the PET flake.
Claim 3
Dependent Claim
27 words
A method as recited in claim 1 wherein the chemical in solution that is reacted with the aluminum so as to dissolve it completely, is sodium hydroxide.
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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |