Patent US3209787A successfully refreshed from Google Patents.
US3209787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system
Assignee: Walker Manufacturing Co
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Filing: 1962-03-26
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Granted: 1965-10-05
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Expires: 1982-03-26
Abstract
No abstract record available.
Inventors
- 👤 Howard L Brown
- 👤 Howard A Callendar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:04
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/08; F01N2450/00; F01N2450/20; F01N2450/22; F01N2470/00; F01N2470/10; F01N2470/20; F01N2470/24; F01N2530/00; F01N2530/02; F01N2530/04; F01N2530/06; Y; Y10; Y10S; Y10S72/00; Y10S72/701; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T29/49908; Y10T29/49925; Y10T29/49927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A SOUND DEADENING PIPE ASSEMBLY FOR CONVEYING THE EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE COMPRISING AN OUTER PIPE, AN INNER PIPE RECEIVED IN SAID OUTER PIPE WITH A SLIGHTLY LOOSE FIT SO THAT SUBSTANTIAL PORTIONS OF THE ADJACENT SURFACES OF SAID PIPES ARE SPACED APART IN THE STRAIGHT SECTIONS OF SAID EXHAUST PIPE ASSEMBLY, AT LEAST ONE BEND FORMED IN SAID EXHAUST PIPE ASSEMBLY, AT LEAST THE OUTER OF SAID PIPES HAVING A SMOOTH WRINKLE-FREE SURFACE IN SAID BEND AND BEING DEFORMED INTO A SLIGHLY EGGSHAPED CONFIGURATION THROUGH SAID BEND, PORTIONS OF SAID INNER AND OUTER PIPES BEING IN TIGHT ENGAGEMENT IN SAID BEND FOR FIXING SAID PIPES IN A PREDETERMINED RELATIVE POSITION, OTHER PORTIONS OF SAID PIPES IN SAID BEND BEING OUT OF ENGAGEMENT WITH A CLEARANCE THROUGHBETWEEN PROVIDING FOR AN AREA FOR METAL TO FLOW DURING BENDING OF SAID PIPES INTO SAID BEND WITHOUT COLLAPSING OR WRINKLING THEREOF.
Claim 2
Dependent Claim
151 words
A SOUND DEADENING PIPE ASSEMBLY FOR CONVEYING THE EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE COMPRISING AN OUTER PIPE, AN INNER PIPE RECEIVED IN SAID OUTER PIPE WITH A SLIGHTLY LOOSE FIT SO THAT SUBSTANTIAL PORTIONS OF THE ADJACENT SURFACES OF SAID PIPES ARE SPACED APART IN THE STRAIGHT SECTIONS OF SAID EXHAUST PIPE ASSEMBLY, AT LEAST ONE BEND FORMED IN SAID EXHAUST PIPE ASSEMBLY, AT LEAST THE OUTER OF SAID PIPES HAVING A SMOOTH WRINKLE-FREE SURFACE IN SAID BEND AND BEING DEFORMED INTO A SLIGHLY EGGSHAPED CONFIGURATION THROUGH SAID BEND, PORTIONS OF SAID INNER AND OUTER PIPES BEING IN TIGHT ENGAGEMENT IN SAID BEND FOR FIXING SAID PIPES IN A PREDETERMINED RELATIVE POSITION, OTHER PORTIONS OF SAID PIPES IN SAID BEND BEING OUT OF ENGAGEMENT WITH A CLEARANCE THROUGHBETWEEN PROVIDING FOR AN AREA FOR METAL TO FLOW DURING BENDING OF SAID PIPES INTO SAID BEND WITHOUT COLLAPSING OR WRINKLING THEREOF.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |