US2679498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atent office
Assignee: —
•
Filing: —
•
Granted: 1954-05-25
•
Expires: 1971-05-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:49
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0003; C09B35/00; C09B35/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR THE ISOLATION OF DIAZONIUM CONDENSATION PRODUCTS FROM THE MIXTURE PRODUCED BY THE INTERACTION, IN THE PRESENCE OF STRONG SULFURIC ACID, OF A DIAZONIUM SALT AND FORMALDEHYDE, CONSISTING OF TREATING SAID REACTION MIXTURE WITH A LARGE VOLUME OF A WATER SOLUBLE ALIPHATIC ALCOHOL WHEREBY THE DIAZONIUM CONDESATION PRODUCTS ARE PRECIPITATED AS A SOLID UNCONTAMINATED WITH DARK COLORED TARRY BYPRODUCTS.
Claim 2
Dependent Claim
61 words
A PROCESS FOR THE ISOLATION OF DIAZONIUM CONDENSATION PRODUCTS FROM THE MIXTURE PRODUCED BY THE INTERACTION, IN THE PRESENCE OF STRONG SULFURIC ACID, OF A DIAZONIUM SALT AND FORMALDEHYDE, CONSISTING OF TREATING SAID REACTION MIXTURE WITH A LARGE VOLUME OF A WATER SOLUBLE ALIPHATIC ALCOHOL WHEREBY THE DIAZONIUM CONDESATION PRODUCTS ARE PRECIPITATED AS A SOLID UNCONTAMINATED WITH DARK COLORED TARRY BYPRODUCTS.
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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |