US3200008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin impregnated papers
Assignee: Evonik Operations GmbH
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Filing: 1962-03-23
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Granted: 1965-08-10
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Expires: 1982-03-23
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Rosemarie
- 👤 Holtschmidt Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:20
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/76; B; B32; B32B; B32B27/00; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/36; D21H17/46; D21H17/47; D21H17/49; D21H17/51; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/26; D21H27/00; D21H27/18; D21H27/22; D21H27/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS OF PREPARING CURABLE RESIN IMPREGNATED PAPER FILMS, WHICH COMPRISES IMPREGNATING PAPER WITH ABOUT 2 TO 50% BY WEIGHT, CALCULATED ON THE WEIGHT OF THE PAPER, OF AN AMINOPLAST CONDENSATION RESIN SELECTED FROM THE GROUP CONSISTING OF UREA FORMALDEHYDE CONDENSATION RESINS AND MELAMINE FORMALDEHYDE CONDENSATION RESINS, THEREAFTER DRYING THE IMPREGNATED PRODUCT UNTIL AN INCOMPLETELY CONDENSED PRODUCT HAS BEEN OBTAINED AN THE MAJOR PORTION OF THE VOLATILE COMPONENTS OF THE RESIN HAS ESCAPED, THEN FURTHER IMPREGNATING THE DRIED PRODUCT WITH PARTIALLY POLYMERIZED DIALLYL PHTHALATE IN AN AMOUNT SUFFICIENT TO FILL THE PORES OF THE PAPER AND TO FORM A SURFACE LAYER ON THE PAPER PRODUCT, AND THEREAFTER FURTHER POLYMERIZING AND DRYING THE PRODUCT TO A NON-STICKY INCOMPLETELY CURED STATE.
Claim 2
Dependent Claim
119 words
A PROCESS OF PREPARING CURABLE RESIN IMPREGNATED PAPER FILMS, WHICH COMPRISES IMPREGNATING PAPER WITH ABOUT 2 TO 50% BY WEIGHT, CALCULATED ON THE WEIGHT OF THE PAPER, OF AN AMINOPLAST CONDENSATION RESIN SELECTED FROM THE GROUP CONSISTING OF UREA FORMALDEHYDE CONDENSATION RESINS AND MELAMINE FORMALDEHYDE CONDENSATION RESINS, THEREAFTER DRYING THE IMPREGNATED PRODUCT UNTIL AN INCOMPLETELY CONDENSED PRODUCT HAS BEEN OBTAINED AN THE MAJOR PORTION OF THE VOLATILE COMPONENTS OF THE RESIN HAS ESCAPED, THEN FURTHER IMPREGNATING THE DRIED PRODUCT WITH PARTIALLY POLYMERIZED DIALLYL PHTHALATE IN AN AMOUNT SUFFICIENT TO FILL THE PORES OF THE PAPER AND TO FORM A SURFACE LAYER ON THE PAPER PRODUCT, AND THEREAFTER FURTHER POLYMERIZING AND DRYING THE PRODUCT TO A NON-STICKY INCOMPLETELY CURED STATE.
References Cited (Backward Citations)
US2964426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |