US3634276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid hardener for phenol aldehyde resins
Assignee: Weyerhaeuser Co
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Filing: 1970-01-07
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Granted: 1972-01-11
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Expires: 1990-01-07
Abstract
Abstract DISCLOSED ARE A LIQUID HARDENER FOR CONVERTING A PHENOL ALDEHYDE RESIN INTO AN ADHESIVE, AND A METHOD OF ITS MANUFACTURE. USE OF THIS HARDENER AVOIDS PROBLEMS ASSOCIATED WITH THE USE OF KNOWN POWDERED HARDENERS, SUCH AS CAKING OR LUMPING UNDER HUMID CONDITIONS, AND THE LONG AND COMPLICATED MIXING PROCEDURE REQUIRED TO BLEND POWDERED HARDENER WITH LIQUID RESIN. THE LIQUID HARDENER IS PREPARED BY COMGINING WATER, ALCOHOL, FORMALDEHYDE SOLUTION, FILLER, PROTECTIVE COLLOID, PYROGENIC SILICA AND WETTING AGENT IN APPROPRIATE PROPORTIONS.
Inventors
- 👤 Roland E Kreibich
- 👤 Harlan G Freeman
- 👤 Gene F Baxter
- 👤 Karl F Kumli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:13
CPC Classifications
C; C09; C09J; C09J161/00; C09J161/04; C09J161/06
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 |