Patent US3065039A successfully refreshed from Google Patents.
US3065039A
Expired / Lapsed
US
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Sulfo-methylated phenol-formaldehyde tanning agents
Assignee: Bayer AG
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Filing: 1958-01-21
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Granted: 1962-11-20
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Expires: 1978-01-21
Abstract
No abstract record available.
Inventors
- 👤 Komarek Ernst
- 👤 Mauthe Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:30
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
AS A NEW TANNING AGENT, A SULFO-METHYLATED PHENOLFORMALDEHYDE CONDENSATE PREPARED BY CONDENING A PHENOLIC MONOMER WITH FORMALDEHYDE IN THE PRESENCE OF ONE-FIFTH TO ONE-HALF MOL OF AN ALKALI METAL HYDROXIDE PER MOL OF THE PHENOLIC MONOMER UNTIL A PARTIALLY CONDENSED RESIN IS FORMED, NEUTRALIZING THE ALKALI WITH SULFUR DIOXIDE AND CONTINUING CONDENSATION IN A NEUTRAL TO WEAKLY ACID MEDIUM UNTIL A WATER-SOLUBLE RESIN IS FORMED, WHEREBY THE WHOLE OF THE ALKALI IS CONTAINED IN THE REACTION PRODUCT AND DOES NOT OCCUR IN THE RESIN AS A NEUTRAL SALT.
Claim 2
Dependent Claim
88 words
AS A NEW TANNING AGENT, A SULFO-METHYLATED PHENOLFORMALDEHYDE CONDENSATE PREPARED BY CONDENING A PHENOLIC MONOMER WITH FORMALDEHYDE IN THE PRESENCE OF ONE-FIFTH TO ONE-HALF MOL OF AN ALKALI METAL HYDROXIDE PER MOL OF THE PHENOLIC MONOMER UNTIL A PARTIALLY CONDENSED RESIN IS FORMED, NEUTRALIZING THE ALKALI WITH SULFUR DIOXIDE AND CONTINUING CONDENSATION IN A NEUTRAL TO WEAKLY ACID MEDIUM UNTIL A WATER-SOLUBLE RESIN IS FORMED, WHEREBY THE WHOLE OF THE ALKALI IS CONTAINED IN THE REACTION PRODUCT AND DOES NOT OCCUR IN THE RESIN AS A NEUTRAL SALT.
References Cited (Backward Citations)
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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) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |