US3663481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-formaldehyde adhesive resin containing hydroxyethyl cellulose
Assignee: Weyerhaeuser Co
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Filing: 1970-04-20
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Granted: 1972-05-16
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Expires: 1990-04-20
Abstract
Abstract IMPROVED PHENOL-FORMALDEHYDE ADHESIVE RESINS SUITABLE FOR PLYWOOD MANUFACTURE ARE OBTAINED BY PREMIXING WITH AQUEOUS FORMALDEHYDE ABOUT 0.3-6.0 WEIGHT PERCENT OF HYDROXYETHYL CELLULOSE BASED ON FORMALDEHYDE AND THEREAFTER REACTING THE HYDROXYETHYL CELLULOSE FORMALDEHYDE SOLUTION WITH PHENOL IN THE PRESENCE OF ALKALI TO OBTAIN A THERMOSETTING PHENOL-FORMALDEHYDE RESOLE RESIN. WHEN FORMULATED AS A PLYWOOD GLUE, THIS MODIFIED PHENOL-FORMALDEHYDE RESIN PROVIDES AN ADHESIVE GLUE WITH ENHANCED TOLERANCE TO A WIDE VARIETY OF WOOD AND PRODUCTION VARIABLES INCLUDING ASSEMBLY TIME.
Inventors
- 👤 Harlan G Freeman
- 👤 Gene F Baxter
- 👤 John T Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:04
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; C08G; C08G8/00; C08G8/28; C09; C09J; C09J161/00; C09J161/04; C09J161/06
Claims Analysis
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |