US2648615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of flameproofing cellulosic wallboard and article produced thereby
Assignee: Individual
•
Filing: 1949-05-24
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Granted: 1953-08-11
•
Expires: 1969-05-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Harold C O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:14
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/80; D06M11/82; D06M11/58; D06M11/66; D21; D21J; D21J1/00; D21J1/08; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31815; Y10T428/31819
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
A METHOD OF TREATING CELLULOSIC MATERIALS COMPRISING THE STEPS OF IMPREGNATING THE CELLULOSIC MATERIAL WITH A SUBSTANTIALLY NEUTRAL AQUEOUS SOLUTION OF AN AMMONIUM COMPOUND WHICH IS SOLID AT ROOM TEMPERATURES BUT WHICH LIBERATES AMMONIA GAS WHEN HEATED TO THE COMBUSTION TEMPERATURE OF THE CELLULOSIC MATERIAL AND A BORATE WHICH IS FUSIBLE AT THE COMBUSTION TEMPERATURE OF THE CELLULOSIC MATERIAL, SUBSTANTIALLY REMOVING THE MOISTURE ADDED BY THE AQUEOUS IMPREGNATING SOLUTION AND COATING THE SURFACE OF THE DRIED MATERIAL WITH AN ORGANIC SOLE OF PYROBITUMEN SUBSTANTIAL FREE OF WATER-SOLUBLE INORGANIC CONTAMINANTS.
References Cited (Backward Citations)
US1418730A
Cited
US1926253A
Cited
US2097509A
Cited
US2142115A
Cited
GB563996A
Cited
US2568849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |