US2931737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnation process
Assignee: HICKSON S TIMBER IMPREGNATION
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Filing: 1958-04-04
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Granted: 1960-04-05
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Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
- 👤 Thornton Jesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:33
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/08; B27N; B27N9/00; D; D21; D21J; D21J1/00; B27K2240/00; B27K2240/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR THE CONTROLLED IMPREGNATION WITH AN IMPREGNANT LIQUID OF A HIGHLY ABSORBENT FIBRE-BOARD OF COMPRESSED COMMINUTED CELLULOSE HAVING A DENSITY NOT EXCEEDING 720 KG./M.3, COMPRISING SUBJECTING THE FIBREBOARD IN A PRESSURE VESSEL TO AN INITIAL SUPERATMOSPHERIC GAS PRESSURE NOT GREATER THAN 3 KG./CM.2 FOR FROM 5-20 MINUTES, INTRODUCING IMPREGNANT LIQUID INTO THE PRESSURE VESSEL UNDER A PRESSURE GREATER THAN THAT OF THE INITIAL GAS PRESSURE BUT NOT GREATER THAN THAT OF THE INITIAL 10-60 MINUTES TO FORCE THE IMPREGNANT LIQUID INTO THE FIBRE-BOARD AGAINST THE INITIAL GAS PRESSURE TO OBTAIN A RELATIVELY HIGH CONCENTRATION OF IMPREGNANT IN THE OUTER PORTIONS OF SAID FIBRE-BOARD WHILE LEAVING THE CENTRE PORTION OF SAID FIBRE-BOARD SUBSTANTIALLY FREE OF IMPREGNANT AND RELEASING THE LIQUID PRESSURE.
Claim 2
Dependent Claim
122 words
A PROCESS FOR THE CONTROLLED IMPREGNATION WITH AN IMPREGNANT LIQUID OF A HIGHLY ABSORBENT FIBRE-BOARD OF COMPRESSED COMMINUTED CELLULOSE HAVING A DENSITY NOT EXCEEDING 720 KG./M.3, COMPRISING SUBJECTING THE FIBREBOARD IN A PRESSURE VESSEL TO AN INITIAL SUPERATMOSPHERIC GAS PRESSURE NOT GREATER THAN 3 KG./CM.2 FOR FROM 5-20 MINUTES, INTRODUCING IMPREGNANT LIQUID INTO THE PRESSURE VESSEL UNDER A PRESSURE GREATER THAN THAT OF THE INITIAL GAS PRESSURE BUT NOT GREATER THAN THAT OF THE INITIAL 10-60 MINUTES TO FORCE THE IMPREGNANT LIQUID INTO THE FIBRE-BOARD AGAINST THE INITIAL GAS PRESSURE TO OBTAIN A RELATIVELY HIGH CONCENTRATION OF IMPREGNANT IN THE OUTER PORTIONS OF SAID FIBRE-BOARD WHILE LEAVING THE CENTRE PORTION OF SAID FIBRE-BOARD SUBSTANTIALLY FREE OF IMPREGNANT AND RELEASING THE LIQUID PRESSURE.
References Cited (Backward Citations)
US1523925A
Cited
US1556570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |