US Patent: 1,323,531
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| Means to measure the suction in the manifolds of internal combustion engines
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Patentee:
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| Edward R. Hewitt (exact or similar names) - Midvale, NJ |
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Patent Dates:
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| Applied: |
Feb. 15, 1919 |
| Granted: |
Dec. 02, 1919 |
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Jeff Joslin
Vintage Machinery entry for Joseph Weidenhoff, Inc.
1938 FTC report on Joseph Weidenhoff, Inc.
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Description: |
| This patent was the subject of a Federal Trade Commission investigation; see link. Joseph Weidenhoff, Inc., licensed this patent and then included this patented vacuum gauge as part of various motor analyzers. They then entered into "agreements and understandings between itself and other manufacturers or distributors of such devices to fix and maintain prices to be extracted from purchasers thereof...through threatened infringement suits based on said patented vacuum gauge". |
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