Patent US3726708A successfully refreshed from Google Patents.
US3726708A
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Process of producing a composite phenolic resin foam article and resultant article
Assignee: Dynamit Nobel AG
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Filing: 1970-06-22
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Granted: 1973-04-10
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Expires: 1990-06-22
Abstract
Abstract A NOVEL COMPOSITE ARTICLE OF A PHENOLIC RESIN FOAM ADHERED TO AN INHERENTLY WATER VAPOR PERVIOUS COVERING AND IMPREGNATED WITH A TAR, BITUMEN OR VINYL, ACRYLIC OR PHENOLIC POLYMER, WHEREBY TO DECREASE THE POROSITY AND INCREASE THE ADHESION STRENGTH. THIS PRODUCT IS MADE BY FOAMING A PHONOLIC RESIN IN CONTACT WITH A POROUS COVERING MATERIAL, SUITALY PAPER, HARDENING AND SETTING THE RESIN FOAM, IMPREGNATING AND COATING THIS FOAM-COVERING MATERIAL ARTICLE WITH ONE OF THE RECITED IMPREGNANTS IN LIQUID FORM, AND THEN DRYING THE PRODUCT.
Inventors
- 👤 F Weissenfels
- 👤 H Juenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; C08L; C08L95/00; C09; C09D; C09D195/00; C08J2361/00; C08J2361/04; C08J2361/06; C08J2495/00; Y; Y10; Y10S; Y10S264/00; Y10S264/02; Y10S264/05; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |