US3176837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package of activated carbon in wet form
Assignee: Calgon Corp
•
Filing: 1963-12-20
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Granted: 1965-04-06
•
Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 John J Hronas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:57
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/382
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PACKAGED ACTIVATED CARBON DIATOMACEOUS EARTH FILTER CHARGE REPLACEMENT IN WET FORM COMPRISING ABOUT 55 TO ABOUT 75 PARTS BY WEIGHT OF WATER, ABOUT 10 TO ABOUT 35 PARTS BY WEIGHT OF PULVERIZED ACTIVATED CARBON.
Claim 2
Dependent Claim
35 words
A PACKAGED ACTIVATED CARBON DIATOMACEOUS EARTH FILTER CHARGE REPLACEMENT IN WET FORM COMPRISING ABOUT 55 TO ABOUT 75 PARTS BY WEIGHT OF WATER, ABOUT 10 TO ABOUT 35 PARTS BY WEIGHT OF PULVERIZED ACTIVATED CARBON.
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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |