Patent US4758733A successfully refreshed from Google Patents.
Patent US3204449A successfully refreshed from Google Patents.
US3204449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing of cigarette filters
Assignee: Brown and Williamson Holdings Inc
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Filing: 1962-04-04
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Granted: 1965-09-07
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Expires: 1982-04-04
Abstract
No abstract record available.
Inventors
- 👤 Fordyce William Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:37
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N15/00; G01N15/08; G01N15/082; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
APPARATUS FOR TESTING THE EFFICIENCY OF A CIGARETTE FILTER COMPRISING: A PNEUMATIC SYSTEM HAVING A LONGITUDINAL PASSAGE; A REMOVABLE FILTER HOLDER RELEASABLY COUPLED WITH THE PNEUMATIC SYSTEM AND HAVING MEANS FOR RELEASABLY HOLDING A CYLINDRICAL FILTER WITH ITS AXIS IN COAXIAL RELATIONSHIP WITH RESPECT TO THE LONGITUDINAL PASSAGE; THE PNEUMATIC SYSTEM HAVING TRANSPARENT TUBE SECTIONS ON EACH SIDE OF SAID FILTER HOLDER; CIGARETTE PUFFING MEANS FOR SMOKING A CIGARETTE HAVING MEANS FOR RELEASABLY MOUNTING THE CIGARETTE AND HAVING FURTHER MEANS FOR INTERMITTENTLY PASSING CIGARETTE SMOKE TO SIMULATE A PUFFING EFFECT THROUGH THE FILTER BY WAY OF THE PNEUMATIC SYSTEM AND SAID TRANSPARENT TUBE SECTIONS; PHOTOMETRIC MEANS FOR MEASURING THE CHANGE IN TKHE CIGARETT SMOKE DESITY BEFORE AND AFTER IT PASSES THE CIGARETTE FILTER; SAID PHOTOMETRIC MEANS HAVING A FIRST LIGHT RESPONSIVE MEANS FOR MEASURING THE DENSITY OF THE SMOKE VIEWED THROUGH ONE OF THE TRANSPARENT TUBE SECTIONS AND A SECOND LIGHT RESPONSIVE MEANS FOR MEASURING THE DENSITY OF THE SMOKE VIEWED THROUGH THE OTHER TRANSPARENT SECTION RESPECTIVELY BEFORE AND AFTER THE SMOKE PASSES THROUGH THE FILTER.
Claim 2
Dependent Claim
176 words
APPARATUS FOR TESTING THE EFFICIENCY OF A CIGARETTE FILTER COMPRISING: A PNEUMATIC SYSTEM HAVING A LONGITUDINAL PASSAGE; A REMOVABLE FILTER HOLDER RELEASABLY COUPLED WITH THE PNEUMATIC SYSTEM AND HAVING MEANS FOR RELEASABLY HOLDING A CYLINDRICAL FILTER WITH ITS AXIS IN COAXIAL RELATIONSHIP WITH RESPECT TO THE LONGITUDINAL PASSAGE; THE PNEUMATIC SYSTEM HAVING TRANSPARENT TUBE SECTIONS ON EACH SIDE OF SAID FILTER HOLDER; CIGARETTE PUFFING MEANS FOR SMOKING A CIGARETTE HAVING MEANS FOR RELEASABLY MOUNTING THE CIGARETTE AND HAVING FURTHER MEANS FOR INTERMITTENTLY PASSING CIGARETTE SMOKE TO SIMULATE A PUFFING EFFECT THROUGH THE FILTER BY WAY OF THE PNEUMATIC SYSTEM AND SAID TRANSPARENT TUBE SECTIONS; PHOTOMETRIC MEANS FOR MEASURING THE CHANGE IN TKHE CIGARETT SMOKE DESITY BEFORE AND AFTER IT PASSES THE CIGARETTE FILTER; SAID PHOTOMETRIC MEANS HAVING A FIRST LIGHT RESPONSIVE MEANS FOR MEASURING THE DENSITY OF THE SMOKE VIEWED THROUGH ONE OF THE TRANSPARENT TUBE SECTIONS AND A SECOND LIGHT RESPONSIVE MEANS FOR MEASURING THE DENSITY OF THE SMOKE VIEWED THROUGH THE OTHER TRANSPARENT SECTION RESPECTIVELY BEFORE AND AFTER THE SMOKE PASSES THROUGH THE FILTER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |