Patent US3634233A successfully refreshed from Google Patents.
US3634233A
Expired / Lapsed
US
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Self-indicating foam concentrate comprising sulfate or sulfonate foaming agent and ph indicator
Assignee: MSA Safety Inc
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Filing: 1970-04-30
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Granted: 1972-01-11
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Expires: 1990-04-30
Abstract
Abstract A FOAM CONCENTRATE CONTAINING AN ANIONIC SULFATE OR SULFONATE FOAMING AGENT USED FOR GENERATING FIRE-FIGHTING FOAMS CONTAINS A COLORIMETRIC INDICATOR THAT CHANGES COLOR BETWEEN ABOUT PH 5 AND PH 6. A CHANGE IN COLOR OF THE CONCENTRATE INDICATES THAT IT IS NOT OPERABLE FOR GENERATING FIRE-FIGHTING FOAMS.
Inventors
- 👤 Ralph H Hiltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:02
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0071
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |