Patent US3000692A successfully refreshed from Google Patents.
US3000692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and filter for purifying exhaust gases of internal combustion engines
Assignee: Individual
•
Filing: 1959-11-16
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Granted: 1961-09-19
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Expires: 1979-11-16
Abstract
No abstract record available.
Inventors
- 👤 Daymond D Duncan
- 👤 Don E Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:22
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0857; F01N13/00; F01N13/009; F01N2240/00; F01N2240/18; F01N2250/00; F01N2250/14; F01N2330/00; F01N2330/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A TWO STAGE FILTER FOR INTERNAL COMBUSTION ENGINES WHEREIN THE FIRST STAGE IS COMPOSED OF VERMICULITE COATED WITH A DRIED MIXTURE OF BENTONITE, SODIUM CHLORIDE AND WATER, THE SECOND STAGE BEING COMPOSED OF VERMICULITE COATED WITH A DRIED MIXTURE OF SLAKED LIME, SODIUM CHLORIDE AND WATER.
Claim 2
Dependent Claim
46 words
A TWO STAGE FILTER FOR INTERNAL COMBUSTION ENGINES WHEREIN THE FIRST STAGE IS COMPOSED OF VERMICULITE COATED WITH A DRIED MIXTURE OF BENTONITE, SODIUM CHLORIDE AND WATER, THE SECOND STAGE BEING COMPOSED OF VERMICULITE COATED WITH A DRIED MIXTURE OF SLAKED LIME, SODIUM CHLORIDE AND WATER.
References Cited (Backward Citations)
US1927102A
Cited
US2112799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |