US3568846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic filter media
Assignee: North Carolina National Bank NCNB
•
Filing: 1968-04-29
•
Granted: 1971-03-09
•
Expires: 1988-04-29
Abstract
Abstract An improved filter media is prepared by subjecting particles of a plastic material having discrete, irregular, nonuniform shaped surfaces to treatment with a quantity of a surfactant or wetting agent sufficient to permit the plastic particles to be readily wetted by water.
Inventors
- 👤 Albert J Haefner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:41
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/02; B01D39/04; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/30; B01J20/32; B01J20/3202; B01J20/3206; B01J20/3208; B01J20/321; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3248; B01J20/3251; B01J20/3253
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
Filter media as defined in claim 1 wherein said polyvinyl chloride is produced by either emulsion, bulk, or suspension polymerization process.
Claim 2
Dependent Claim
22 words
Filter media as defined in claim 1 wherein the surfactant is selected from the group consisting of cationic, anionic, and nonionic surfactants.
Claim 3
Dependent Claim
14 words
Filter media as defined in claim 1 wherein the surfactant is sodium lauryl sulfate.
Claim 4
Dependent Claim
14 words
Filter media as defined in claim 1 wherein the surfactant is sodium dioctyl sulfosuccinate.
Claim 5
Dependent Claim
37 words
Filter media as defined in claim 1 wherein said polyvinyl chloride particles are treated with the surfactant in a concentration of from about 0.001 percent to about 1.0 percent weight based on the weight of said particles.
References Cited (Backward Citations)
US2040818A
Cited
US2036258A
Cited
US2106318A
Cited
US2101961A
Cited
US2398284A
Cited
US2508602A
Cited
US2448337A
Cited
US2464204A
Cited
US2668151A
Cited
US2564926A
Cited
US2612966A
Cited
US3327859A
Cited
US3424674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |