US2615783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of keratin
Assignee: Procter and Gamble Co
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Filing: 1950-08-11
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Granted: 1952-10-28
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Expires: 1970-08-11
Abstract
No abstract record available.
Inventors
- 👤 John W Haefele
- 👤 Tucker Nathaniel Beverley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:13
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/248
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE PROCESS OF TREATING KERATIN-CONTAINING SUBSTANCE TO MODIFY CHEMICAL AND PHYSICAL CHARACTERISTICS THEREOF WHETEIN THE SAID SUBSTANCE IS SUBJECTED TO THE ACTION OF A SULFUR CONTAINING REDUCING AGENT AND THE DISULFIDE LINKAGES OF KERATIN ARE CONVERTED TO SULFHYDRYL GROUPS, THE STEP OF REACTING REDUCED KERATIN AT A PH OF AOUT 4 TO ABOUT 10.5 WITH AN AQUEOUS SOLUTION OF AT LEAST ONE ORGANIC POLYTHIOSULFATE OF THE GROUP CONSISTING OF WATER-SOLUBLE POLYTHIOSULFATES OF ALKANES AND ALKENES AND SUBSTITUTED ALKANES AND ALKENES TO CONVERT REDUCED KERATIN TO POLYDISULFIDE CONTAINING THE ORGANIC GROUP OF SAID ORGANIC POLYTHIOSULFATE.
Claim 2
Dependent Claim
95 words
IN THE PROCESS OF TREATING KERATIN-CONTAINING SUBSTANCE TO MODIFY CHEMICAL AND PHYSICAL CHARACTERISTICS THEREOF WHETEIN THE SAID SUBSTANCE IS SUBJECTED TO THE ACTION OF A SULFUR CONTAINING REDUCING AGENT AND THE DISULFIDE LINKAGES OF KERATIN ARE CONVERTED TO SULFHYDRYL GROUPS, THE STEP OF REACTING REDUCED KERATIN AT A PH OF AOUT 4 TO ABOUT 10.5 WITH AN AQUEOUS SOLUTION OF AT LEAST ONE ORGANIC POLYTHIOSULFATE OF THE GROUP CONSISTING OF WATER-SOLUBLE POLYTHIOSULFATES OF ALKANES AND ALKENES AND SUBSTITUTED ALKANES AND ALKENES TO CONVERT REDUCED KERATIN TO POLYDISULFIDE CONTAINING THE ORGANIC GROUP OF SAID ORGANIC POLYTHIOSULFATE.
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |