Famous Patents
Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
PatentStorm News
Make the Most of PatentStorm
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest patents by subscribing to an RSS feed.
Got questions? Ask a Patent Expert!
Registered users: Manage your profile, comments and alerts.
US Patent 4693307 - Tube and fin heat exchanger with hybrid heat transfer fin arrangement
US Patent Issued on September 15, 1987
Estimated Patent Expiration Date:
September 29, 2006Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 29, 2006Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA motor vehicle tube and fin heat exchanger is disclosed comprising a plurality of tubes arranged in spaced side-by-side relationship and a plurality of louvered fins arranged in spaced side-by-side relationship and between and in heat transfer relationship with adjacent ones of the tubes. The fins preferably have a thickness and stacked density such as to constitute not more than 12% nor less than 2.5% of the space between the adjacent tubes, a total louvered area not more than 60% nor less the 40% of the total fin area, and a linear fin edge projection density of not more than 1.2 mm-1 nor less than 0.68 mm-1. | InventorAssigneeApplicationNo. 06/912575 filed on 09/29/1986US Classes:165/152, Deformed sheet forms passages between side-by-side tube means165/153With tube manifoldField of Search165/152, Deformed sheet forms passages between side-by-side tube means165/153With tube manifoldExaminersPrimary: Davis, Albert W. Jr.Assistant: Neils, Peggy A. Attorney, Agent or FirmUS Patent References3003749, 3521707, 3993125Heat exchange deviceIssued on: 11/23/1976 Inventor: Rhodes International ClassF28F 1/12 (20060101) |
