US3276186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter composition and method of removing hydrogen sulfide from water
Assignee: Calgon Corp
•
Filing: 1964-07-22
•
Granted: 1966-10-04
•
Expires: 1984-07-22
Abstract
No abstract record available.
Inventors
- 👤 John J Hronas
- 👤 Joseph L Rizzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:51
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; C02F1/281; Y; Y10; Y10S; Y10S210/00; Y10S210/902
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
34 words
A FILTER COMPOSITION USEFUL FOR REMOVING HYDROGEN SULFIDE FROM LIQUIDS COMPRISING, BY WEIGHT, ABOUT 1% TO ABOUT 99% ACTIVATED CARBON, UP TO ABOUT 99% FILTER MEDIUM, AND ABOUT 1% TO ABOUT 80% CUPROUS OXIDE.
Claim 2
Dependent Claim
34 words
A FILTER COMPOSITION USEFUL FOR REMOVING HYDROGEN SULFIDE FROM LIQUIDS COMPRISING, BY WEIGHT, ABOUT 1% TO ABOUT 99% ACTIVATED CARBON, UP TO ABOUT 99% FILTER MEDIUM, AND ABOUT 1% TO ABOUT 80% CUPROUS OXIDE.
Claim 3
Dependent Claim
19 words
METHOD OF REMOVING HYDROGEN SULFIDE FROM A LIQUID COMPRISING CONTACTING SAID LIQUID WITH THE FILTER COMPOSITION OF CLAIM 1.
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |