Patent US2920316A successfully refreshed from Google Patents.
Patent US3250703A successfully refreshed from Google Patents.
US3250703A
Expired / Lapsed
US
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Process and apparatus for removing impurities from liquids
Assignee: Union Tank Car Co
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Filing: 1963-03-08
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Granted: 1966-05-10
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Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Levendusky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/22; B01D25/26; B01J; B01J47/00; B01J47/12; B01J47/133; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
THE METHOD OF REMOVING IMPURITIES FROM A LIQUID WHICH COMPRISES PRE-COATING A FILTER SCREEN BY DEPOSITING UPON SAID FILTER SCREEN A LAYER OF ION EXCHANGE RESIN PARTICLES IN THE SIZE RANGE OF ABOUT 60 TO 400 MESH AND PASSING SAID LIQUID THROUGH SAID PRE-COAT LAYER AND SAID FILTER SCREEN.
Claim 2
Independent Claim
49 words
THE METHOD OF REMOVING IMPURITIES FROM A LIQUID WHICH COMPRISES PRE-COATING A FILTER SCREEN BY DEPOSITING UPON SAID FILTER SCREEN A LAYER OF ION EXCHANGE RESIN PARTICLES IN THE SIZE RANGE OF ABOUT 60 TO 400 MESH AND PASSING SAID LIQUID THROUGH SAID PRE-COAT LAYER AND SAID FILTER SCREEN.
References Cited (Backward Citations)
US2952363A
Cited
US3132094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |