US3872056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of phenol/formaldehyde resins
Assignee: Individual
•
Filing: 1974-01-14
•
Granted: 1975-03-18
•
Expires: 1994-01-14
Abstract
Abstract Manufacture of phenol/formaldehyde resins containing sulfo groups from phenols, formaldehyde or formaldehyde-donating substances and quadrivalent sulfur compounds at temperatures above 125*C.
Inventors
- 👤 Ewald Daubach
- 👤 Hermann Windel
- 👤 Walter Boehm
- 👤 Dieter Weiser
- 👤 Manfred Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:12
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A PROCESS FOR THE MANUFACTURE OF SULFO GROUPCONTAINING PHENOL FORMALDEHYDE CONDENSATES ON THE BASIS OF ALKALINE CONDENSATION OF PHENOLS, FORMALDEHYDE OR FORMALDEHYDEDONATING SUBSTANCES, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE AND SODIUM BISULFITE AND ALKALI METAL HYDROXIDE AT ELEVATED TEMPERATURE, WHICH PHENOLS, FORMALDEHYDE OR FORMALDEHYDE-DONATING SUBSTANCES, COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE AND SOIDUM BISULFITE AND ALKALI METAL HYDROXIDES ARE USED IN THE CONDENSATION IN MOLAR RATIOS OF FROM 1:1.0:0.3:0.05 TO 1:4:1.6:0.5, WHEREIN THE IMPROVEMENT COMPRISES EFFECTING CONDENSATION USING PHENOL ITSELF AS STARTING COMPONENT AT TEMPERATURES OF FROM 125* TO 200*C.
Claim 2
Dependent Claim
98 words
IN A PROCESS FOR THE MANUFACTURE OF SULFO GROUPCONTAINING PHENOL FORMALDEHYDE CONDENSATES ON THE BASIS OF ALKALINE CONDENSATION OF PHENOLS, FORMALDEHYDE OR FORMALDEHYDEDONATING SUBSTANCES, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE AND SODIUM BISULFITE AND ALKALI METAL HYDROXIDE AT ELEVATED TEMPERATURE, WHICH PHENOLS, FORMALDEHYDE OR FORMALDEHYDE-DONATING SUBSTANCES, COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE AND SOIDUM BISULFITE AND ALKALI METAL HYDROXIDES ARE USED IN THE CONDENSATION IN MOLAR RATIOS OF FROM 1:1.0:0.3:0.05 TO 1:4:1.6:0.5, WHEREIN THE IMPROVEMENT COMPRISES EFFECTING CONDENSATION USING PHENOL ITSELF AS STARTING COMPONENT AT TEMPERATURES OF FROM 125* TO 200*C.
References Cited (Backward Citations)
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Cited
US3062783A
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US2870041A
Cited
US3230197A
Cited
US3687603A
Cited
US3677979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |