Patent US3445258A successfully refreshed from Google Patents.
US3445258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bituminous emulsions
Assignee: Chevron USA Inc
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Filing: 1964-10-19
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Granted: 1969-05-20
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Expires: 1984-10-19
Abstract
No abstract record available.
Inventors
- 👤 Richard L Ferm
- 👤 Russell F Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:22
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
AN OIL-IN WATER TYPE MIXING-GRADE CATIONIC BITUMINOUS EMULSION COMPRISING FROM ABOUT 50 TO ABOUT 75% BY WEIGHT OF BITUMEN; FROM ABOUT 0.15 TO ABOUT 2.0% BY WEIGHT OF AN EMULSIFIER SELECTED FROM THE GROUP CONSISTING OF MATERIALS CORRESPONDING TO THE FORMULAE:
Claim 2
Dependent Claim
41 words
AN OIL-IN WATER TYPE MIXING-GRADE CATIONIC BITUMINOUS EMULSION COMPRISING FROM ABOUT 50 TO ABOUT 75% BY WEIGHT OF BITUMEN; FROM ABOUT 0.15 TO ABOUT 2.0% BY WEIGHT OF AN EMULSIFIER SELECTED FROM THE GROUP CONSISTING OF MATERIALS CORRESPONDING TO THE FORMULAE:
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |