US2740728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of resin-impregnated porous bodies
Assignee: Dow Chemical Co
•
Filing: 1954-01-25
•
Granted: 1956-04-03
•
Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Sonnabend
- 👤 Charles R Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:31
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/15; C; C08; C08L; C08L97/00; C08L97/02; C08K; C08K3/00; C08K3/28; C08L61/00; C08L61/04; C08L61/06; C08L61/20; C08L61/22; C08L61/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
A METHOD OF RESINIFYING WOOD WHICH COMPRISES EVACUATING AIR FROM THE WOOD, THEN CONTACTING AND IMPREGNATING THE WOOD WITH GASEOUS AMMONIA AT A PRESSURE AT LEAST AS HIGH AS ATMOSPHERIC PRESSURE, DISPLACING THE SURROUNDING ATMOSPHERE OF UNABSORBED AMMONIA GAS WITH AIR, IMMERSING THE AMMONIA-IMPREGNATED WOOD IN A NON-RESINOUS LIQUID COMPRISING AN ALDEHYDE AND AN ORGANIC COMPOUND CONDENSIBLE THEREWITH, WHICH LIQUID IS CAPABLE OF REACTING UNDER THE ACTION OF HEAT AND THE AMMONIA AS A CATALYST TO FORM A SOLID RESIN, IMPREGNATING THE WOOD WITH THE LIQUID, REMOVING UNABSORBED LIQUID FROM CONTACT WITH THE IMPREGNATED WOOD, AND HEATING THE LATTER AT TEMPERATURES BETWEEN 50* AND 150* C. IN CONTACT WITH A SUBSTANTIALLY NON-REACTIVE GAS AT SUPERATMOSPHERIC PRESSURE TO FORM A RESIN WITHIN THE WOOD.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |