US3013908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
B-stage dicyandiamide-formaldehyde condensation product, process of preparing the same, and process of plumping tanned leather
Assignee: Bayer AG
•
Filing: 1957-11-22
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Granted: 1961-12-19
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Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Luck Wolfhard
- 👤 Zorn Bruno
- 👤 Mauthe Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C14; C14C; C14C9/00; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/14; C08G12/16; C14C11/00; C14C11/003; Y; Y10; Y10T; Y10T428/00; Y10T428/4935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
THE PROCESS OF PREPARING AN ACID-PRECIPITABLE WATERSOLUBLE B-STAGE DICYANDIAMIDE-FORMALDEHYDE CONDENSATION PRODUCT, STABILIZED IN THE B-STAGE, WHICH COMPRISES HEATING A REACTION MIXTURE COMPRISING FORMALDEHYDE AND DICYANDIAMIDE IN THE PROPORTION OF FROM ABOUT 0.5 TO ABOUT 5 MOLES OF FORMALDEHYDE PER MOLE OF DICYANDIAMIDE IN AQUEOUS SOLUTION AT A PH OF MORE THAN 7 TO FORM A WATER-INSOLUBLE B-STAGE REACTION PRODUCT, STABILIZING THE WATER-INSOLUBLE B-STAGE REACTION PRODUCT IN THE BSTAGE BY INCORPORATING THEREIN BY CHEMICAL REACTION FROM ABOUT 0.01 TO ABOUT 0.5 MOLE OF A WATER-SOLUBLE ALKALI METAL SALT OF SULFUROUS ACID, AND SOLUBILIZING THE WATERINSOLUBLE B-STAGE REACTION PRODUCT BY HEATING THE SAME WITH A WATER-SOLUBLE ALKALI METAL SALT OF AN ORGANIC SULFONIC ACID.
Claim 2
Dependent Claim
112 words
THE PROCESS OF PREPARING AN ACID-PRECIPITABLE WATERSOLUBLE B-STAGE DICYANDIAMIDE-FORMALDEHYDE CONDENSATION PRODUCT, STABILIZED IN THE B-STAGE, WHICH COMPRISES HEATING A REACTION MIXTURE COMPRISING FORMALDEHYDE AND DICYANDIAMIDE IN THE PROPORTION OF FROM ABOUT 0.5 TO ABOUT 5 MOLES OF FORMALDEHYDE PER MOLE OF DICYANDIAMIDE IN AQUEOUS SOLUTION AT A PH OF MORE THAN 7 TO FORM A WATER-INSOLUBLE B-STAGE REACTION PRODUCT, STABILIZING THE WATER-INSOLUBLE B-STAGE REACTION PRODUCT IN THE BSTAGE BY INCORPORATING THEREIN BY CHEMICAL REACTION FROM ABOUT 0.01 TO ABOUT 0.5 MOLE OF A WATER-SOLUBLE ALKALI METAL SALT OF SULFUROUS ACID, AND SOLUBILIZING THE WATERINSOLUBLE B-STAGE REACTION PRODUCT BY HEATING THE SAME WITH A WATER-SOLUBLE ALKALI METAL SALT OF AN ORGANIC SULFONIC ACID.
Claim 3
Dependent Claim
19 words
AN ACID-PRECIPITABLE WATER-SOLUBLE B-STAGE DICYANDIAMIDE-FORMALDEHYDE CONDENSATION PRODUCT, STABILIZED IN THE B-STAGE, AND PREPARED BY THE PROCESS OF CLAIM 1.
Claim 4
Dependent Claim
36 words
A PROCESS FOR PLUMPING TANNED LEATHER WHICH COMPRISES IMPREGNATING MOIST TANNED LEATHER WITH AN AQUEOUS SOLUTION OF THE REACTION PRODUCT OF CLAIM 3, AND PRECIPITATING THE CONDENSATION PRODUCT IN THE LEATHER AT A PH BELOW 7.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |