Patent US3277162A successfully refreshed from Google Patents.
US3277162A
Expired / Lapsed
US
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Water-soluble condensation products of naphthalenesulfonic acid and formaldehyde
Assignee: EIDP Inc
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Filing: 1962-09-04
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Granted: 1966-10-04
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Expires: 1982-09-04
Abstract
No abstract record available.
Inventors
- 👤 Johnson Robert Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:54
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22; C04B24/226; C07; C07G; C07G99/00; C07G99/002; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE WATER-SOLUBLE SALT OF THE CONDENSATION PRODUCT OF NAPTHALENESULFONIC ACID AND FORMALDEHYDE, THE CATION OF SAID SALT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, CALCIUM, AND AMMONIUM IONS, SAID CONDENSATION PRODUCT BEING FORMED BY CONDENSING 1 MOL OF NAPHTHALENESULFONIC ACID WITH 1 TO 3 MOLS OF FORMALDEHYDE WHILE PERIODICALLY ADDING ENOUGH WATER TO KEEP THE MASS STIRRABLE, SAID CONDENSATION AND SAID WATER ADDITIONS BEING CONTINUED UNTIL THE CONDENSATION PRODUCT IN THE FORM OF THE SALT EXHIBITS A VISCOSITY OF 1.5 TO 10 CENTIPOISES IN A 12 WT. PERCENT WATER SOLUTION AT 25*C.
Claim 2
Dependent Claim
94 words
THE WATER-SOLUBLE SALT OF THE CONDENSATION PRODUCT OF NAPTHALENESULFONIC ACID AND FORMALDEHYDE, THE CATION OF SAID SALT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, CALCIUM, AND AMMONIUM IONS, SAID CONDENSATION PRODUCT BEING FORMED BY CONDENSING 1 MOL OF NAPHTHALENESULFONIC ACID WITH 1 TO 3 MOLS OF FORMALDEHYDE WHILE PERIODICALLY ADDING ENOUGH WATER TO KEEP THE MASS STIRRABLE, SAID CONDENSATION AND SAID WATER ADDITIONS BEING CONTINUED UNTIL THE CONDENSATION PRODUCT IN THE FORM OF THE SALT EXHIBITS A VISCOSITY OF 1.5 TO 10 CENTIPOISES IN A 12 WT. PERCENT WATER SOLUTION AT 25*C.
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |