US2677675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making light colored and light stable phenolic syntans
Assignee: Wyeth Holdings LLC
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Filing: 1949-08-09
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Granted: 1954-05-04
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Expires: 1969-08-09
Abstract
No abstract record available.
Inventors
- 👤 Daniel E Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:00
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS WHICH CONSISTS OF MIXING A SULFONATE PRODUCT OF THE CONDENSATION OF PHENOL AND FORMALDEHYDE WITH A SUFFICIENT QUANTITY OF A SUBSTANCE OF THE GROUP CONSISTING OF SULFUR DIOXIDE, SULFUROUS ACID AND WATER-SOLUBLE SALTS THEREOF TO PROVIDE A FREE SO2 CONCENTRATION OF AT LEAST ABOUT 0.5 PART PER THOUSAND WHEREBY THE RESULTING COMPOSITION IS STABLE AGAINST DISCOLORATION UPON STORAGE UNDER NORMAL CONDITIONS.
Claim 2
Dependent Claim
63 words
A PROCESS WHICH CONSISTS OF MIXING A SULFONATE PRODUCT OF THE CONDENSATION OF PHENOL AND FORMALDEHYDE WITH A SUFFICIENT QUANTITY OF A SUBSTANCE OF THE GROUP CONSISTING OF SULFUR DIOXIDE, SULFUROUS ACID AND WATER-SOLUBLE SALTS THEREOF TO PROVIDE A FREE SO2 CONCENTRATION OF AT LEAST ABOUT 0.5 PART PER THOUSAND WHEREBY THE RESULTING COMPOSITION IS STABLE AGAINST DISCOLORATION UPON STORAGE UNDER NORMAL CONDITIONS.
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) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |