US2552129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tanning with a free aldehyde and a free polyhydric phenol mixture in a molecular ratio of at least 2 to 1
Assignee: John R Evans & Co
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Filing: 1946-05-11
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Granted: 1951-05-08
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Expires: 1966-05-11
Abstract
No abstract record available.
Inventors
- 👤 Windus Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:02
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; Y; Y10; Y10S; Y10S530/00; Y10S530/827; Y10S530/842
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
PROCESS OF TANNING WHICH COMPRISES SUBJECTING A TANNABLE PROTEIN MATERIALL TO THE ACTION OF AN AQUEOUS SOLUTION CONTAINING BOTH A FREE POLYHDRIC PHENOL FROM THE GROUP CONSISTING OF RESORCINOL AND PYROGALLOL AND AA FREE ALDEHYDE FROM THE GROUP CONSISTING OF FORMALDEHYDE, FURFURAL, BENZALDEHYDE AND CROTONALDEHYDE, THE RELATIVE PROPRTIONS OF SAID PHENOL AND SAID ALDEHYDE BEING SUCH THAT THERE ARE PRESENT IN SAID SOLUTION AT LEAST TWO MOLS OF THE ALDEHYDE TO EACH MOL OF THE PHENOL, THE HYDROGEN-ION CONCENTRATION OF THE SOLUTION BEING ADJUSTED TO AND MAINTAINED DURING THE TANNING ACTION WITHIN THE RANGE OF FROM ABOUT PH 0.3 TO ABOUT PH 3.0.
Claim 2
Dependent Claim
103 words
PROCESS OF TANNING WHICH COMPRISES SUBJECTING A TANNABLE PROTEIN MATERIALL TO THE ACTION OF AN AQUEOUS SOLUTION CONTAINING BOTH A FREE POLYHDRIC PHENOL FROM THE GROUP CONSISTING OF RESORCINOL AND PYROGALLOL AND AA FREE ALDEHYDE FROM THE GROUP CONSISTING OF FORMALDEHYDE, FURFURAL, BENZALDEHYDE AND CROTONALDEHYDE, THE RELATIVE PROPRTIONS OF SAID PHENOL AND SAID ALDEHYDE BEING SUCH THAT THERE ARE PRESENT IN SAID SOLUTION AT LEAST TWO MOLS OF THE ALDEHYDE TO EACH MOL OF THE PHENOL, THE HYDROGEN-ION CONCENTRATION OF THE SOLUTION BEING ADJUSTED TO AND MAINTAINED DURING THE TANNING ACTION WITHIN THE RANGE OF FROM ABOUT PH 0.3 TO ABOUT PH 3.0.
References Cited (Backward Citations)
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Cited
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Cited
US1232620A
Cited
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Cited
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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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |