US3928253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of clean polyester materials
Assignee: Horizons Inc
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Filing: 1972-05-10
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Granted: 1975-12-23
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Expires: 1992-05-10
Abstract
Abstract A procedure for separating and recovering clean polyester separately from the materials with which it is coated and for recovering desired values present in the coating materials, whereby the recovered polyester and other valuable recovered materials may be recycled thereby avoiding, or minimizing pollution from such materials. When the starting material is a polyester photographic film, the treatment includes detaching the contaminants from the polyester film base by contacting the polyester photographic film scrap with an aqueous solution of monoethanolamine containing 2% to 15% by weight of water and having a temperature between 100*C and 170*C, for a time sufficient to remove both the coating and the subcoating from said base.
Inventors
- 👤 J Scott Thornton
- 👤 Donald E Glowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:16
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
CONTACTING SAID POLYESTER PHOTOGRAPHIC FILM SCRAP WITH AN AQUEOUS SOLUTION OF AN ALKALINE ORGANIC LIQUID REAGENT WHICH WILL DETCH THE CONTAMINANTS FROM THE POLYESTER FILM BASE MATERIAL, SAID AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF MONOETHANOLAMINE AND 2% TO 15% BY WEIGHT OF WATER AND HAVING A TEMPERATURE BETWEEN 100*C AND 170*C, FOR A TIME SUFFICIENT TO REMOVE BOTH THE COATING AND THE SUBCOATING FROM SAID BASE,
Claim 2
Dependent Claim
65 words
CONTACTING SAID POLYESTER PHOTOGRAPHIC FILM SCRAP WITH AN AQUEOUS SOLUTION OF AN ALKALINE ORGANIC LIQUID REAGENT WHICH WILL DETCH THE CONTAMINANTS FROM THE POLYESTER FILM BASE MATERIAL, SAID AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF MONOETHANOLAMINE AND 2% TO 15% BY WEIGHT OF WATER AND HAVING A TEMPERATURE BETWEEN 100*C AND 170*C, FOR A TIME SUFFICIENT TO REMOVE BOTH THE COATING AND THE SUBCOATING FROM SAID BASE,
Claim 3
Dependent Claim
64 words
A PROCESS FOR THE SEQUARATE RECOVERY OF CLEAN POLYESTER AND CONTAMINANTS ASSOCIATED THEREWITH FROM POLYESTER PHOTOGRAPHIC FILM SCRAP CONSISTING OF A POLYESTER BASE, A SUBCOATING ON SAID BASE SAID SUBCOATING CONSISTING ESSENTIALLY OF COPOLYMERS OF VINYL CHLORIDE OR VINYLIDENE CHLORIDE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF ITACONIC, ACRYLIC AND METHACRYLIC AND A SILVER CONTAINING GELATINE COATING ON SAID SUBCOATING WHICH COMPRISES:
Claim 4
Dependent Claim
64 words
A PROCESS FOR THE SEQUARATE RECOVERY OF CLEAN POLYESTER AND CONTAMINANTS ASSOCIATED THEREWITH FROM POLYESTER PHOTOGRAPHIC FILM SCRAP CONSISTING OF A POLYESTER BASE, A SUBCOATING ON SAID BASE SAID SUBCOATING CONSISTING ESSENTIALLY OF COPOLYMERS OF VINYL CHLORIDE OR VINYLIDENE CHLORIDE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF ITACONIC, ACRYLIC AND METHACRYLIC AND A SILVER CONTAINING GELATINE COATING ON SAID SUBCOATING WHICH COMPRISES:
Claim 5
Dependent Claim
11 words
physically separating the polyester material from the solution and contaminants; and
Claim 6
Dependent Claim
11 words
physically separating the polyester material from the solution and contaminants; and
Claim 7
Dependent Claim
11 words
PHYSICALLY SEPARATING THE POLYESTER MATERIAL FROM THE SOLUTION AND CONTAMINANTS, AND
Claim 8
Dependent Claim
11 words
PHYSICALLY SEPARATING THE POLYESTER MATERIAL FROM THE SOLUTION AND CONTAMINANTS, AND
Claim 9
Dependent Claim
6 words
recovering the resulting clean polyester material.
Claim 10
Dependent Claim
6 words
recovering the resulting clean polyester material.
Claim 11
Dependent Claim
6 words
RECOVERING THE RESULTING CLEAN POLYESTER MATERIAL.
Claim 12
Dependent Claim
6 words
RECOVERING THE RESULTING CLEAN POLYESTER MATERIAL.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |