Patent US3704269A successfully refreshed from Google Patents.
US3704269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foams and process of making
Assignee: Weyerhaeuser Co
•
Filing: 1971-01-22
•
Granted: 1972-11-28
•
Expires: 1991-01-22
Abstract
Abstract DISCLOSED HEREIN IS A PROCESS OF MAKING A THERMOSETTING CELLULAR FOAMS, AND THE INSOLUBLE INFUSIBLE FOAMED PRODUCTS MADE THEREFROM FOR USE AS INSULATING BARRIERS IN BUILDING CONSTRUCTION AND OTHER APPLICATIONS WERE LIGHT WEIGHT INSULATING MATERIALS ARE NEEDED. A FOAMING AGENT IS BLENDED INTO A LIQUID RESIN COMPRISING THE REACTION PRODUCT OF (1) AN ALDEHYDE CONDENSATION POLYMER HAVING REACTIVE ALKYLOL GROUPS, MODIFIED BY A NITROGEN-CONTAINING COMPOUND AND (2) AN ALDEHYDE OR ALDEHYDE-POLYEPOXIDE MIXTURE. THE RESINOUS COMPOSITIONS FORM AN INSOLUBLE, INFUSIBLE, CURED FOAM IN 20 TO 200 SECONDS AT ROOM TEMPERATURE, MAKING THEM USEFUL IN FOAMING-IN-PLACE APPLICATIONS.
Inventors
- 👤 Harlan G Freeman
- 👤 Maurice F Gillern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J2361/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |