US4565638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying ink
Assignee: Individual
•
Filing: 1983-09-22
•
Granted: 1986-01-21
•
Expires: 2003-09-22
Abstract
Abstract Excess or unused ink that is recovered from a printing process and which contains fibrous impurities is purified by mixing the recovered ink with virgin ink, heating the mixture to decrease the viscosity thereof, and then straining and filtering the heated mixture.
Inventors
- 👤 Jerry Zucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:13
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
Method for purifying used printing ink containing impurities comprising the steps of first combining a volume of the used ink with a greater volume of virgin ink to reduce the level of impurities in the combined volume, heating and agitating the mixture to reduce the viscosity thereof, and then removing the impurities from the heated mixture.
Claim 2
Dependent Claim
56 words
Method for purifying used printing ink containing impurities comprising the steps of first combining a volume of the used ink with a greater volume of virgin ink to reduce the level of impurities in the combined volume, heating and agitating the mixture to reduce the viscosity thereof, and then removing the impurities from the heated mixture.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the mixture is heated to a temperature of from about 150 to about 200 degrees F.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the impurities are removed by passing the heated mixture through a series of progressively finer filters.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein the heated mixture is pumped under pressure through the filters.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |