Patent US3353544A successfully refreshed from Google Patents.
US3353544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco-smoke filters
Assignee: Brown and Williamson Holdings Inc
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Filing: 1965-06-08
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Granted: 1967-11-21
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Expires: 1985-06-08
Abstract
No abstract record available.
Inventors
- 👤 Fordyce William Brian
- 👤 Horsewell Henry George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:12
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/02; A24D3/0229; A24D3/0241
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A METHOD OF PRODUCING A BONDED, SELF-SUSTAINING, POROUS TOBACCO SMOKE FILTER WHICH COMPRISES MIXING PARTICLES OF TOBACCO SMOKE FILTER MATERIAL WITH PARTICLES OF LOW MELTING BONDING MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE HYDRATES OF SIMPLE AND COMPLEX CRYSTALLINE METALLIC SALTS OF INORGANIC ACIDS AND METALLIC SALTS OF ORGANIC ACIDS, THE PARTICLE SIZE OF THE BONDING MATERIAL BEING AT LEAST SUBSTANTIALLY EQUAL TO THE PARTICLE SIZE OF FILTER MATERIAL; FEEDING THE MIXTURE AT A SUBSTANTIALLY CONSTANT RATIO ONTO A MOVING CHANNEL-SHAPED PAPER BAND; FOLDING THE PAPER BAND AND MIXTURE INTO A ROD; HEATING THE FOLDED ROD TO A TEMPERATURE NOT IN EXCESS OF 250*C. TO SOFTEN THE LOW MELTING BONDING MATERIAL SO THAT THE SOFTENED LOW MELTING BONDING MATERIAL CONTACTS SURFACES OF THE PARTICLES OF FILTER MATERIAL; AND THEN COOLING THE HEATED ROD TO SOLIDIFY THE LOW MELTING BONDING MATERIAL TO FORM A FIRMLY BONDED ROD.
Claim 2
Independent Claim
147 words
A METHOD OF PRODUCING A BONDED, SELF-SUSTAINING, POROUS TOBACCO SMOKE FILTER WHICH COMPRISES MIXING PARTICLES OF TOBACCO SMOKE FILTER MATERIAL WITH PARTICLES OF LOW MELTING BONDING MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE HYDRATES OF SIMPLE AND COMPLEX CRYSTALLINE METALLIC SALTS OF INORGANIC ACIDS AND METALLIC SALTS OF ORGANIC ACIDS, THE PARTICLE SIZE OF THE BONDING MATERIAL BEING AT LEAST SUBSTANTIALLY EQUAL TO THE PARTICLE SIZE OF FILTER MATERIAL; FEEDING THE MIXTURE AT A SUBSTANTIALLY CONSTANT RATIO ONTO A MOVING CHANNEL-SHAPED PAPER BAND; FOLDING THE PAPER BAND AND MIXTURE INTO A ROD; HEATING THE FOLDED ROD TO A TEMPERATURE NOT IN EXCESS OF 250*C. TO SOFTEN THE LOW MELTING BONDING MATERIAL SO THAT THE SOFTENED LOW MELTING BONDING MATERIAL CONTACTS SURFACES OF THE PARTICLES OF FILTER MATERIAL; AND THEN COOLING THE HEATED ROD TO SOLIDIFY THE LOW MELTING BONDING MATERIAL TO FORM A FIRMLY BONDED ROD.
Claim 3
Dependent Claim
108 words
A TOBACCO SMOKE FILTER COMPRISING A BONDED, POROUS, SELF-SUSTAINING ROD FORMED OF A MIXTURE OF PARTICLES OF A TOBACCO SMOKE FILTER MATERIAL AND A PARTICULATE LOW MELTING BONDING MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE HYDRATES OF SIMPLE AND COMPLEX CRYSTALLINE METALLIC SALTS OF AN INORGANIC ACID AND METALLIC SALTS OF AN ORGANIC ACID, THE BONDING MATERIAL HAVING A MELTING POINT NOT IN EXCESS OF 250*C.; THE PARTICLE SIZE OF THE BONDING MATERIAL BEING AT LEAST SUBSTANTIALLY EQUAL TO THE PARTICLE SIZE OF THE FILTER MATERIAL SO THAT THE BONDING MATERIAL IS IN ADHESIVE CONTACT WITH SURFACES OF THE FILTER MATERIAL TO FORM A TOBACCO SMOKE FILTER.
Claim 4
Dependent Claim
108 words
A TOBACCO SMOKE FILTER COMPRISING A BONDED, POROUS, SELF-SUSTAINING ROD FORMED OF A MIXTURE OF PARTICLES OF A TOBACCO SMOKE FILTER MATERIAL AND A PARTICULATE LOW MELTING BONDING MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE HYDRATES OF SIMPLE AND COMPLEX CRYSTALLINE METALLIC SALTS OF AN INORGANIC ACID AND METALLIC SALTS OF AN ORGANIC ACID, THE BONDING MATERIAL HAVING A MELTING POINT NOT IN EXCESS OF 250*C.; THE PARTICLE SIZE OF THE BONDING MATERIAL BEING AT LEAST SUBSTANTIALLY EQUAL TO THE PARTICLE SIZE OF THE FILTER MATERIAL SO THAT THE BONDING MATERIAL IS IN ADHESIVE CONTACT WITH SURFACES OF THE FILTER MATERIAL TO FORM A TOBACCO SMOKE FILTER.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |