US2826477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of tanning skins with acidic solutions of alkali metal zirconium silicates
Assignee: Rohm and Haas Co
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Filing: 1954-05-18
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Granted: 1958-03-11
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Expires: 1974-05-18
Abstract
No abstract record available.
Inventors
- 👤 William J Rau
- 👤 Ian C Somerville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A PROCESS OF TANNING A SKIN COMPRISING TANNING THE SKIN IN AN AQUEOUS SOLUTION OF AN ACIDIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF SULFRIC ACID, HYDROCHLORIC ACID, NIYTRIC ACID, SODIUM ACID SULFATE, AND SULFAMIC ACID, AT A TEMPERATURE NOT OVER 35*C., CONTAINING SUS PENDEDTHEREIN A PULVERIZED WATER-INSOLUBLE DOUBLE SILICATE OF ZIRCONIUM AND AN ALKALI METAL M IN WHICH THE MOLAR RATIO SIO2:ZRO2 IS FROM ABOUT 1:1 UP TO BUT NOT OVER 1.5:11 AND THE MOLAR RATIO SIO2:M2O IS FROM ABOUT 1:1 UP BUT NOT OVER 3:1, THE ACIDITY BEING ADJUSTED TO PROVIDE THE CORRESPONDING SALT OF ZIRCONIUM OF ZERO TO 60% BASICITY CALCULATED ON THE SCHORELEMER SCALE UPON COMPLETE DISSOCIATION OF THE SODIUM ZIRCONIUM SILICATE, THE SKIN REMAINING IN THEIS TANNING LIQUOR UNTIL IT IS TANNED TO THE DESIRED EXTENT.
Claim 2
Dependent Claim
131 words
A PROCESS OF TANNING A SKIN COMPRISING TANNING THE SKIN IN AN AQUEOUS SOLUTION OF AN ACIDIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF SULFRIC ACID, HYDROCHLORIC ACID, NIYTRIC ACID, SODIUM ACID SULFATE, AND SULFAMIC ACID, AT A TEMPERATURE NOT OVER 35*C., CONTAINING SUS PENDEDTHEREIN A PULVERIZED WATER-INSOLUBLE DOUBLE SILICATE OF ZIRCONIUM AND AN ALKALI METAL M IN WHICH THE MOLAR RATIO SIO2:ZRO2 IS FROM ABOUT 1:1 UP TO BUT NOT OVER 1.5:11 AND THE MOLAR RATIO SIO2:M2O IS FROM ABOUT 1:1 UP BUT NOT OVER 3:1, THE ACIDITY BEING ADJUSTED TO PROVIDE THE CORRESPONDING SALT OF ZIRCONIUM OF ZERO TO 60% BASICITY CALCULATED ON THE SCHORELEMER SCALE UPON COMPLETE DISSOCIATION OF THE SODIUM ZIRCONIUM SILICATE, THE SKIN REMAINING IN THEIS TANNING LIQUOR UNTIL IT IS TANNED TO THE DESIRED EXTENT.
References Cited (Backward Citations)
FR917317A
Cited
US2689163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |