US3946101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering material
Assignee: Individual
•
Filing: 1973-07-10
•
Granted: 1976-03-23
•
Expires: 1993-07-10
Abstract
Abstract A fluid filter, especially useful for cigarettes and the like, comprises cellulose which has been oxidized by an inorganic metal nitrate, such as manganese nitrate.
Inventors
- 👤 Alfred J. Harendza-Harinxma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:42
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; B; B01; B01D; B01D53/00; B01D53/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A method of filtering noxious, carcinogenic or objectionable gases from a mixture of gases comprising the step of passing said mixture of gases through a filter containing the complex metallic product resulting from re-acting cellulose with an inorganic nitrate of the formula Me(NO 3 ) n where Me represents a metal atom selected from the group consisting of manganese, nickel, aluminum, calcium, iron, sodium, zinc, and copper and n is a number corresponding to the valence number of the metal atom.
Claim 2
Independent Claim
81 words
A method of filtering noxious, carcinogenic or objectionable gases from a mixture of gases comprising the step of passing said mixture of gases through a filter containing the complex metallic product resulting from re-acting cellulose with an inorganic nitrate of the formula Me(NO 3 ) n where Me represents a metal atom selected from the group consisting of manganese, nickel, aluminum, calcium, iron, sodium, zinc, and copper and n is a number corresponding to the valence number of the metal atom.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said complex metallic product includes an inert granular material to increase the porosity of the filter.
Claim 4
Dependent Claim
13 words
The method according to claim 2 wherein said inert granular material comprises pumice.
Claim 5
Dependent Claim
41 words
The method according to claim 1 wherein said complex metallic product further includes activated charcoal to remove any nitrogen-based gases added to the mixture of gases by said inorganic nitrate as it reacts with the mixture of gases to be filtered.
References Cited (Backward Citations)
US3007917A
Cited
US3372979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |