Patent US4606320A successfully refreshed from Google Patents.
US4606320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel preheating unit
Assignee: Individual
•
Filing: 1986-01-14
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Granted: 1986-08-19
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Expires: 2006-01-14
Abstract
Abstract A fuel preheating unit for internal combustion engines is placed between the carburetor and fuel pump. The unit consists of spaced concentric insulating sleeves surrounding the fuel line and held in assembled relationship by end plates. An electrical heating element includes several wire turns immediately surrounding the interior insulating sleeve with wire terminals extending exteriorly of the unit. The unit is encased in a body of insulating material, such as asbestos cement.
Inventors
- 👤 Keith F. McGee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:03
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/12; F02M31/125; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A fuel preheating unit for engines comprising an interior metal tube adapted for connection in a fuel line, first and second insulator sleeves surrounding said tube in spaced substantially concentric relationship, end plates surrounding said tube and being interengaged with the ends of said sleeves and holding said sleeves in said spaced concentric relationship, an electrical wire heating element surrounding the innermost of the first and second sleeves and having plural turns on the innermost sleeve extending for a major portion of the length of such sleeve and the length of the unit, and a body of thermal insulating material surrounding and enclosing at least a portion of said tube and completely enclosing said sleeves and end plates, and said heating element having end terminals projecting exteriorly of said body of thermal insulating material.
Claim 2
Dependent Claim
134 words
A fuel preheating unit for engines comprising an interior metal tube adapted for connection in a fuel line, first and second insulator sleeves surrounding said tube in spaced substantially concentric relationship, end plates surrounding said tube and being interengaged with the ends of said sleeves and holding said sleeves in said spaced concentric relationship, an electrical wire heating element surrounding the innermost of the first and second sleeves and having plural turns on the innermost sleeve extending for a major portion of the length of such sleeve and the length of the unit, and a body of thermal insulating material surrounding and enclosing at least a portion of said tube and completely enclosing said sleeves and end plates, and said heating element having end terminals projecting exteriorly of said body of thermal insulating material.
Claim 3
Dependent Claim
41 words
A fuel preheating unit for engines as defined in claim 1, and said first and second sleeves comprising cylindrical sleeves formed of a ceramic material, and said end plates having annular corrugations forming locating seats for the ends of said sleeves.
Claim 4
Dependent Claim
38 words
A fuel preheating unit for engines as defined in claim 2, and the interior one of the sleeves closely surrounding said tube, and there being a substantially dead air space between said sleeves and between said end plates.
Claim 5
Dependent Claim
178 words
A fuel preheating unit particularly for internal combusion engines comprising a metal tubing section, a first insulator sleeve closely surrounding the tubing section, a second insulator sleeve of the same length as the first sleeve and being of a greater diameter than the first sleeve surrounding the first sleeve in spaced concentric relationship, a pair of corrugated end plates abutting the ends of said sleeves and having annular concentric corrugations forming locator seats for the ends of said sleeves, said sleeves being cylindrical, a resistance wire heating element closely wound around the exterior of the first sleeve and having a plurality of turns spanning a major portion of the length of the first sleeve and said unit, and a body of insulating material enclosing said sleeves and end plates and surrounding the tubing section and serving to unite the sleeves, end plates and tubing section, and the resistance wire heating element having end terminals projecting radially through apertures in the second sleeve near the ends of the second sleeve and projecting radially through said body of insulating material.
Claim 6
Dependent Claim
178 words
A fuel preheating unit particularly for internal combusion engines comprising a metal tubing section, a first insulator sleeve closely surrounding the tubing section, a second insulator sleeve of the same length as the first sleeve and being of a greater diameter than the first sleeve surrounding the first sleeve in spaced concentric relationship, a pair of corrugated end plates abutting the ends of said sleeves and having annular concentric corrugations forming locator seats for the ends of said sleeves, said sleeves being cylindrical, a resistance wire heating element closely wound around the exterior of the first sleeve and having a plurality of turns spanning a major portion of the length of the first sleeve and said unit, and a body of insulating material enclosing said sleeves and end plates and surrounding the tubing section and serving to unite the sleeves, end plates and tubing section, and the resistance wire heating element having end terminals projecting radially through apertures in the second sleeve near the ends of the second sleeve and projecting radially through said body of insulating material.
References Cited (Backward Citations)
US1065580A
Cited
US1278880A
Cited
US1401500A
Cited
US2851027A
Cited
US4212275A
Cited
US4325345A
Cited
US4424422A
Cited
US4423712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |