Patent CA790434A successfully refreshed from Google Patents.
Patent US2994620A successfully refreshed from Google Patents.
US2994620A
Expired / Lapsed
US
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Method for fireproofing cellulosic materials
Assignee: Ignicel SA
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Filing: 1957-11-06
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Granted: 1961-08-01
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Expires: 1977-11-06
Abstract
No abstract record available.
Inventors
- 👤 Franck Jean-Jacques
- 👤 Sandor Basile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:27
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/68; D06M11/70; D06M11/71; B; B27; B27K; B27K3/00; B27K3/02; B27K3/0278; B27K3/0285; B27K3/16; B27K3/20; B27K2200/00; B27K2200/10; B27K2240/00; B27K2240/30; B27K2240/70; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A RAPID PROCESS FOR FIREPROOFING CELLULOSE AND LIGNOCELLULOSE MATERIAL, WHICH COMPRISES IMPREGNATING SAID MATERIAL WITH AN AQUEOUS SOLUTION OF AMMONIA IN A CONCENTRATION AND FOR A PERIOD OF TIME SUFFICIENT TO EXPAND THE CHANNELS AND CELLS IN THE MATERIAL AND TO PERMIT THE PENETRATION INTO SAID MATERIAL OF A DESIRED QUANTITY OF AMMONIUM IONS BUT INSUFFICIENT TO ALTER THE FIBERS THEREOF: AND THEREAFTER CAUSING PHOSPHORIC IONS TO PENETRATE INTO SAID MATERIAL BY CONTACTING SAID MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING ORTHOPHOSPHORIC ACID IONS IN A CONCENTRATION AND FOR A PERIOD OF TIME SUFFICIENT FOR THE PHOSPHORIC IONS TO COMBINE WITH SAID AMMONIUM IONS PRESENT IN SAID MATERIAL TO FORM IN SITU AT THE TIME OF DRYING AN AMMONIUM PHOSPHATE UNIFORMLY DISTRIBUTED THROUGHOUT SAID MATERIAL WHILE GIVING SAID MATERIAL A PH VALUE THAT DOES NOT ALTER ITS INITIAL MECHANICAL AND SURFACE PROPERTIES.
Claim 2
Dependent Claim
141 words
A RAPID PROCESS FOR FIREPROOFING CELLULOSE AND LIGNOCELLULOSE MATERIAL, WHICH COMPRISES IMPREGNATING SAID MATERIAL WITH AN AQUEOUS SOLUTION OF AMMONIA IN A CONCENTRATION AND FOR A PERIOD OF TIME SUFFICIENT TO EXPAND THE CHANNELS AND CELLS IN THE MATERIAL AND TO PERMIT THE PENETRATION INTO SAID MATERIAL OF A DESIRED QUANTITY OF AMMONIUM IONS BUT INSUFFICIENT TO ALTER THE FIBERS THEREOF: AND THEREAFTER CAUSING PHOSPHORIC IONS TO PENETRATE INTO SAID MATERIAL BY CONTACTING SAID MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING ORTHOPHOSPHORIC ACID IONS IN A CONCENTRATION AND FOR A PERIOD OF TIME SUFFICIENT FOR THE PHOSPHORIC IONS TO COMBINE WITH SAID AMMONIUM IONS PRESENT IN SAID MATERIAL TO FORM IN SITU AT THE TIME OF DRYING AN AMMONIUM PHOSPHATE UNIFORMLY DISTRIBUTED THROUGHOUT SAID MATERIAL WHILE GIVING SAID MATERIAL A PH VALUE THAT DOES NOT ALTER ITS INITIAL MECHANICAL AND SURFACE PROPERTIES.
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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) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |