Patent US3888641A successfully refreshed from Google Patents.
US3888641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of erasing smoke
Assignee: Nittan Co Ltd
•
Filing: 1973-07-17
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Granted: 1975-06-10
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Expires: 1993-07-17
Abstract
Abstract The method of removal of smoke particularly in confined areas by spraying an aqueous solution of a surfactant into the smoke.
Inventors
- 👤 Shoji Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:23
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0028; A62D1/0035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN THE METHOD OF REMOVING SMOKE IN A BUILDING WHEREIN SMOKE IS PRODUCED BY FIRE FORMING A SMOKE FILLED AREA, THE IMPROVEMENT COMPRISING THE STEPS OF FORMING A AQUEOUS SOLUTION CONTAINING UP TO ABOUT 1% OF A SURFACTANT WHEREIN SAID SURFACTANT CONSTITUTES AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF DIALKYL SULFOSUCCINATES, ALKYL SUFLATES, ALKYL BENZENESULFONATES, RECINOLIC ESTER SULFATES, ALKYL ESTERS OF A-SULFOFATTY ACID, MONOSODIUM A-PHOSPHONOFATTY ACID ESTERS, DIALKYL PHOSPHATES, POLYOXYETHYLENEALKYL SULFATES, POLYETHYLENEALKYL PHENOLS, POLYOXYETHYLENEALKYL ETHERS AND TRIPOLYOXYETHYLENEALKYL PHOSPHATES AND THEN SPRAYING SAID SOLUTION INTO THE SMOKE FILLED AREA TO SETTLE THE SMOKE PARTICLES.
Claim 2
Dependent Claim
96 words
IN THE METHOD OF REMOVING SMOKE IN A BUILDING WHEREIN SMOKE IS PRODUCED BY FIRE FORMING A SMOKE FILLED AREA, THE IMPROVEMENT COMPRISING THE STEPS OF FORMING A AQUEOUS SOLUTION CONTAINING UP TO ABOUT 1% OF A SURFACTANT WHEREIN SAID SURFACTANT CONSTITUTES AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF DIALKYL SULFOSUCCINATES, ALKYL SUFLATES, ALKYL BENZENESULFONATES, RECINOLIC ESTER SULFATES, ALKYL ESTERS OF A-SULFOFATTY ACID, MONOSODIUM A-PHOSPHONOFATTY ACID ESTERS, DIALKYL PHOSPHATES, POLYOXYETHYLENEALKYL SULFATES, POLYETHYLENEALKYL PHENOLS, POLYOXYETHYLENEALKYL ETHERS AND TRIPOLYOXYETHYLENEALKYL PHOSPHATES AND THEN SPRAYING SAID SOLUTION INTO THE SMOKE FILLED AREA TO SETTLE THE SMOKE PARTICLES.
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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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |