Patent US2775504A successfully refreshed from Google Patents.
US2775504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing hair and wool from animal hides and skins
Assignee: Individual
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Filing: 1951-04-14
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Granted: 1956-12-25
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Expires: 1971-04-14
Abstract
No abstract record available.
Inventors
- 👤 Haskiel Zalcman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:10
CPC Classifications
C; C14; C14C; C14C1/00; C14C1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
IN THE ART OF DEPILATING LAMB AND SHEEP SKINS BY APPLYING A DEPILATORY PAINT TO THE FLESH SIDE OF THE SKINS, THE METHOD OF EFFECTING DEPILATION TO OBTAIN HIGH QUALITY WOOL WHILE PRESERVING THE QUALITY OF THE SKIN WHICH CONSISTS IN APPLYING TO THE FLESH SIDE OF THE SKIN AN AQUEOUS COMPOSITION WHICH IS SUBSTANTIALLY FREE OF SOURCES OF MONOVALENT METAL CATIONS AND WHICH COMPRISES CALCIUM HYDROSULPHIDE AND LIME, THE CALCIUM HYDROSULPHIDE BEING ABOUT 3 TO 7% AND THE LIME ABOUT 25 TO 14%, EACH BY WEIGHT OF THE COMPOSITION, THE PROPORTION OF CALCIUM HYDROSULPHIDE DECREASING AND OF LIME INCREASING WITHIN THE ABOVE RANGES WITH THE INCREASING THICKNESS AND FAT CONTENT OF THE SKIN, THE COMPOSITION HAVING A PH OF NOT MORE THAN 12 AND NOT LESS THAN ABOUT 11.7, AND THE SOURCE OF HYDROXYL IONS BEING SUFFICIENT IN QUANTITY TO PROVIDE AN UNDISSOLVED RESERVE THEREOF SUSPENDED IN THE COMPOSITION; ALLOWING THE COMPOSITION TO REMAIN ON THE SKIN UNTIL THE WOOL IS LOOSENED, AND THEN PULLING THE LOOSENED WOOL FROM THE SKIN.
Claim 2
Dependent Claim
172 words
IN THE ART OF DEPILATING LAMB AND SHEEP SKINS BY APPLYING A DEPILATORY PAINT TO THE FLESH SIDE OF THE SKINS, THE METHOD OF EFFECTING DEPILATION TO OBTAIN HIGH QUALITY WOOL WHILE PRESERVING THE QUALITY OF THE SKIN WHICH CONSISTS IN APPLYING TO THE FLESH SIDE OF THE SKIN AN AQUEOUS COMPOSITION WHICH IS SUBSTANTIALLY FREE OF SOURCES OF MONOVALENT METAL CATIONS AND WHICH COMPRISES CALCIUM HYDROSULPHIDE AND LIME, THE CALCIUM HYDROSULPHIDE BEING ABOUT 3 TO 7% AND THE LIME ABOUT 25 TO 14%, EACH BY WEIGHT OF THE COMPOSITION, THE PROPORTION OF CALCIUM HYDROSULPHIDE DECREASING AND OF LIME INCREASING WITHIN THE ABOVE RANGES WITH THE INCREASING THICKNESS AND FAT CONTENT OF THE SKIN, THE COMPOSITION HAVING A PH OF NOT MORE THAN 12 AND NOT LESS THAN ABOUT 11.7, AND THE SOURCE OF HYDROXYL IONS BEING SUFFICIENT IN QUANTITY TO PROVIDE AN UNDISSOLVED RESERVE THEREOF SUSPENDED IN THE COMPOSITION; ALLOWING THE COMPOSITION TO REMAIN ON THE SKIN UNTIL THE WOOL IS LOOSENED, AND THEN PULLING THE LOOSENED WOOL FROM THE SKIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |