US2591218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guanide-formaldehyde condensation products for tanning and bleaching leather
Assignee: Wyeth Holdings LLC
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Filing: 1949-08-12
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Granted: 1952-04-01
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Expires: 1969-08-12
Abstract
No abstract record available.
Inventors
- 👤 Jack T Thurston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:52
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PROCESS WHICH COMPRISES IMPREGNATING SKINS AND HIDES WITH AN AQUEOUS SOLUTION OF A WATER-DILUTABLE, ACID-SENSITIVE CONDENSATION PRODUCT OF 1 MOL OF A GUANIDE OF THE FORMULA:
Claim 2
Dependent Claim
27 words
A PROCESS WHICH COMPRISES IMPREGNATING SKINS AND HIDES WITH AN AQUEOUS SOLUTION OF A WATER-DILUTABLE, ACID-SENSITIVE CONDENSATION PRODUCT OF 1 MOL OF A GUANIDE OF THE FORMULA:
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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |