US3765225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon filter leak detector
Assignee: American Air Filter Co Inc
•
Filing: 1972-10-30
•
Granted: 1973-10-16
•
Expires: 1992-10-30
Abstract
Abstract The invention provides a method for testing a carbon type unit filter for leaks, wherein the material used to test the filter is reactive with the carbon filter media. This method of testing unit filters for leaks has the advantages of allowing precise location of any leakage paths, and avoiding loading of the filter during the testing operation.
Inventors
- 👤 R Rivers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:40
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A method of testing carbon type unit filters for leaks comprising: introducing a carbon reactive material on the upstream side of said filter; passing said carbon reactive material through said carbon filter, whereupon said material reacts with the carbon contained therein to form a substantially nontoxic nonreactive product with only the carbon reactive material, which passes through leaks, passing unchanged therethrough; detecting the unchanged carbon reactive material on the downstream side of said filter.
Claim 2
Independent Claim
74 words
A method of testing carbon type unit filters for leaks comprising: introducing a carbon reactive material on the upstream side of said filter; passing said carbon reactive material through said carbon filter, whereupon said material reacts with the carbon contained therein to form a substantially nontoxic nonreactive product with only the carbon reactive material, which passes through leaks, passing unchanged therethrough; detecting the unchanged carbon reactive material on the downstream side of said filter.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said carbon reactive material is ozone and said nontoxic nonreactive product is carbon dioxide.
References Cited (Backward Citations)
US3395514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |