Patent US2641356A successfully refreshed from Google Patents.
Patent US3004072A successfully refreshed from Google Patents.
US3004072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making 4,4'-di(halomethyl) diphenyl oxides and product
Assignee: Dow Chemical Co
•
Filing: 1959-03-26
•
Granted: 1961-10-10
•
Expires: 1979-03-26
Abstract
No abstract record available.
Inventors
- 👤 James D Doedens
- 👤 Earl H Rosenbrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:32
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/18; C07C41/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A METHOD FOR MAKING A 4,4''-DIHALOMETHYL DIPHENYL OXIDE WHEREIN HALO IS A MEMBER OF THE GROUP CONSISTING OF CHLORO AND BROMO, WHICH METHOD COMPRISES HEATING A MIXTURE OF PROPORTIONS OF 1 MOLE DIPHENYL OXIDE, ABOUT 2 TO ABOUT 4 MOLES OF FORMALDEHYDE, ABOUT 2 TO ABOUT 4 MOLES OF A CONCENTRATED HYDROGEN HALIDE OF THE GROUP CONSISTING OF HYDROCHLORIC AND HYDROBROMIC ACID, ABOUT 10 TO ABOUT 40 WEIGHT PERCENT OF CONCENTRATED ACETIC ACID, TOTAL REACTANTS BASIS, AND ABOUT 15 TO ABOUT 30 WEIGHT PERCENT OF A CONCENTRATED MINERAL ACID OF THE GROUP CONSISTING OF SULFURIC AND PHOSPHORIC ACID, TOTAL REACTANTS BASIS, AT A TEMPERATURE RANGING BETWEEN ABOUT 70* AND ABOUT 100*C. FOR A TIME RANGING BETWEEN ABOUT 3/4 AND ABOUT 3 HOURS, DEPENDENT UPON TEMPERATURE, AND SEPARATING DIHALOMETHYL DIPHENYL OXIDE PRODUCT.
Claim 2
Independent Claim
131 words
A METHOD FOR MAKING A 4,4''-DIHALOMETHYL DIPHENYL OXIDE WHEREIN HALO IS A MEMBER OF THE GROUP CONSISTING OF CHLORO AND BROMO, WHICH METHOD COMPRISES HEATING A MIXTURE OF PROPORTIONS OF 1 MOLE DIPHENYL OXIDE, ABOUT 2 TO ABOUT 4 MOLES OF FORMALDEHYDE, ABOUT 2 TO ABOUT 4 MOLES OF A CONCENTRATED HYDROGEN HALIDE OF THE GROUP CONSISTING OF HYDROCHLORIC AND HYDROBROMIC ACID, ABOUT 10 TO ABOUT 40 WEIGHT PERCENT OF CONCENTRATED ACETIC ACID, TOTAL REACTANTS BASIS, AND ABOUT 15 TO ABOUT 30 WEIGHT PERCENT OF A CONCENTRATED MINERAL ACID OF THE GROUP CONSISTING OF SULFURIC AND PHOSPHORIC ACID, TOTAL REACTANTS BASIS, AT A TEMPERATURE RANGING BETWEEN ABOUT 70* AND ABOUT 100*C. FOR A TIME RANGING BETWEEN ABOUT 3/4 AND ABOUT 3 HOURS, DEPENDENT UPON TEMPERATURE, AND SEPARATING DIHALOMETHYL DIPHENYL OXIDE PRODUCT.
References Cited (Backward Citations)
DE569570C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |