US3343680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and method of making same
Assignee: General Services Co
•
Filing: 1964-02-17
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Granted: 1967-09-26
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Archie H Rice
- 👤 Walter R Conley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:17
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; B01D24/00; B01D24/001; B01D24/02; B01D24/10; B01D24/16; B01D24/46; B01D24/4631
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A FILTER FOR FILTRATION OF WATER COMPRISING: A BED HAVING A CONTINUALLY INCREASING NUMBER OF PARTICLES PER UNIT AREA IN THE DIRECTION OF WATER FLOW THROUGH THE BED; SAID PARTICLES COMPRISING INTERMIXED FILTER MEDIA OF AT LEAST THREE DIFFERENT SPECIFIC GRAVITIES; THERE BEING AT LEAST FIVE PERCENT BY WEIGHT OF A MEDIA OF EACH SPECIFIC GRAVITY PRESENT.
Claim 2
Dependent Claim
57 words
A FILTER FOR FILTRATION OF WATER COMPRISING: A BED HAVING A CONTINUALLY INCREASING NUMBER OF PARTICLES PER UNIT AREA IN THE DIRECTION OF WATER FLOW THROUGH THE BED; SAID PARTICLES COMPRISING INTERMIXED FILTER MEDIA OF AT LEAST THREE DIFFERENT SPECIFIC GRAVITIES; THERE BEING AT LEAST FIVE PERCENT BY WEIGHT OF A MEDIA OF EACH SPECIFIC GRAVITY PRESENT.
References Cited (Backward Citations)
US293745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |