Patent EP0335656A1 successfully refreshed from Google Patents.
Patent US2841480A successfully refreshed from Google Patents.
US2841480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead scavenger compositions
Assignee: Shell Development Co
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Filing: 1953-04-24
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Granted: 1958-07-01
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Expires: 1973-04-24
Abstract
No abstract record available.
Inventors
- 👤 Venard E Yust
- 👤 John L Bame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:59
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/20; C10L1/201; C10L1/202; C10L1/26; C10L1/2633; C10L1/2641; C10L1/265; C10L1/30; C10L1/305; C10L1/306
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
A FUEL COMPOSITION FOR INTERNAL COMBUSTION ENGINES CONSISTING ESSENTIALLY OF A STABLE GASOLINE, A MINOR EFFECTIVE ANTI-DETONANT AMOUNT OF TETRA LOWER ALKYL LEAD ANTIDETONANT, AND A SCAVENGER MIXTURE FOR SAID ANTI-DETONANT CONSISTING ESSENTIALLY OF A HALOHYDROCARBON SCAVENGER AND OF A PHOSPHORUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRI-HETEROCYCLIC RING OF WHICH CONTAINS FROM PHOSPHITES, EACH RING OF WHICH CONTAINS FROM 5 THROUGH 6 ATOMS CONSISTING OF CARBON AND ONLY A SINGLE ATOM SELECTED FORM THE GROUP CONSISTING OF OXYGEN, SULFUR AND NITROGEN AND EACH HETEROCYCLIC GROUP OF WHICH IS ATTACHED TO THE PHOSPHORUS ATOM THROUGH A CHALCOGEN ATOM HAVING AN ATOMIC NUMBER OF FROM 8 THROUGH 16, SAID HALOHYDROCARBON SCAVENGER AND SAID PHOSPHORUS COMPOUND BEING PRESENT IN AMOUNTS SUCH THAT, WHERE A IS A THE NUMBER OF MOLS OF SAID HALOHYDROCARBON SCAVENGER PRESENT MULTIPLIED BY ONE-HALF THE NUMBER OF HALOGEN ATOMS PER MOLECULE FOR EACH GRAM ATOM OF LEAD IN THE LEAD ANTI-DETONANT PRESENT, AND B IS THE NUMBER OF MOLS OF SAID PHOSPHORUS COMPOUND PRESENT MULTIPLIED BY THREE-HALVES, FOR EACH GRAM ATOM OF LEAD IN THE LEAD ANTI-DETONANT PRESENT, THE TOTAL OF A PLUS B IS FROM ABOUT 0.4 TO ABOUT 2.0, B IS FROM ABOUT 0.01 TO ABOUT 0.6, AND THE RATION OF A TO B IS FROM ABOUT 3.2 TO ABOUT 100:1.
Claim 2
Dependent Claim
216 words
A FUEL COMPOSITION FOR INTERNAL COMBUSTION ENGINES CONSISTING ESSENTIALLY OF A STABLE GASOLINE, A MINOR EFFECTIVE ANTI-DETONANT AMOUNT OF TETRA LOWER ALKYL LEAD ANTIDETONANT, AND A SCAVENGER MIXTURE FOR SAID ANTI-DETONANT CONSISTING ESSENTIALLY OF A HALOHYDROCARBON SCAVENGER AND OF A PHOSPHORUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRI-HETEROCYCLIC RING OF WHICH CONTAINS FROM PHOSPHITES, EACH RING OF WHICH CONTAINS FROM 5 THROUGH 6 ATOMS CONSISTING OF CARBON AND ONLY A SINGLE ATOM SELECTED FORM THE GROUP CONSISTING OF OXYGEN, SULFUR AND NITROGEN AND EACH HETEROCYCLIC GROUP OF WHICH IS ATTACHED TO THE PHOSPHORUS ATOM THROUGH A CHALCOGEN ATOM HAVING AN ATOMIC NUMBER OF FROM 8 THROUGH 16, SAID HALOHYDROCARBON SCAVENGER AND SAID PHOSPHORUS COMPOUND BEING PRESENT IN AMOUNTS SUCH THAT, WHERE A IS A THE NUMBER OF MOLS OF SAID HALOHYDROCARBON SCAVENGER PRESENT MULTIPLIED BY ONE-HALF THE NUMBER OF HALOGEN ATOMS PER MOLECULE FOR EACH GRAM ATOM OF LEAD IN THE LEAD ANTI-DETONANT PRESENT, AND B IS THE NUMBER OF MOLS OF SAID PHOSPHORUS COMPOUND PRESENT MULTIPLIED BY THREE-HALVES, FOR EACH GRAM ATOM OF LEAD IN THE LEAD ANTI-DETONANT PRESENT, THE TOTAL OF A PLUS B IS FROM ABOUT 0.4 TO ABOUT 2.0, B IS FROM ABOUT 0.01 TO ABOUT 0.6, AND THE RATION OF A TO B IS FROM ABOUT 3.2 TO ABOUT 100:1.
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |