Manufacturers Index - Duff Manufacturing Co.
Duff Manufacturing Co.
Pittsburgh, PA, U.S.A.
Manufacturer Class:
Metal Working Machinery
This page contains information on patents issued to this manufacturer.
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292,630
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Jan. 29, 1884
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Pipe-lifter for oil-wells
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James B. Duff |
Pittsburgh, PA |
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Pipe-lifter for oil-wells
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Samuel K. Duff |
Allegheny, PA |
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293,400
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Feb. 12, 1884
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
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312,316
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Feb. 17, 1885
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
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RE10,574
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Mar. 24, 1885
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
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RE10,651
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Oct. 13, 1885
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
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399,470
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Mar. 12, 1889
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
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RE11,051
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Dec. 31, 1889
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
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455,993
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Jul. 14, 1891
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
This patent provides an alternative mechanism for the jack shown in patent 312,316. |
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455,994
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Jul. 14, 1891
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
This patent provides a simplified mechanism for the jack of patent 399,470. |
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455,995
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Jul. 14, 1891
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Lifting-jack
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Josiah Barrett |
Allegheny, PA |
Improvements to the jacks of patent 312,316 and 455,993. |
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495,689
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Apr. 18, 1893
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Oil-well-drilling apparatus
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Josiah Barrett |
Allegheny, PA |
The inventor was superintendent of Duff Mfg. Co. Barrett had a sideline in jacks and wrenches related to oil drilling. These products were made, and branded, by Duff Mfg.. We do not know if this particular patent was ever manufactured. |
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511,923
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Jan. 02, 1894
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Jack
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Josiah Barrett |
Allegheny, PA |
Improvements to patents 312,316 and 455,993. |
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511,924
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Jan. 02, 1894
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Artesian-well apparatus
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Josiah Barrett |
Allegheny, PA |
Improvements to the inventor's earlier patent 495,689. Unlike most of this inventor's patents, it was not assigned to his employer, Duff Mfg. Co. |
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527,102
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Oct. 09, 1894
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Jack
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Josiah Barrett |
Allegheny, PA |
This patent covers the adaptation of Barrett's jack design for use with oil-well wrenches. See also patent 422,879, granted to one William Forgie. Forgie had approached Barrett with the basic idea of adapting one of Barrett's jacks to this purpose, but he apparently did not have any mechanical ability himself. Barrett designed something, one of Duff Mfg. Co.'s patternmakers made the required patterns, and Barrett produced the jacks for sale by Forgie, who found the jacks were quite successful. The jacks had "Barrett Patent" on them, which Forgie ground off and substituted his own name. Barrett protested when he found out and demanded that Forgie cease doing that, which he did. But then Forgie applied for, and obtained, a patent for Barrett's invention, and then sued Barrett for infringing his patent: Forgie v. Oil-Well Supply Co., Ltd. Forgie emphatically lost that lawsuit, Barrett subsequently applied for a patent, and this patent is the result. |
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1,052,921
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Feb. 11, 1913
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Lifting-jack
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Isaiah E. Hindman |
Crafton, PA |
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1,054,413
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Feb. 25, 1913
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Lifting-jack
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Isaiah E. Hindman |
Crafton, PA |
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1,089,703
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Mar. 10, 1914
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Friction-clutch device
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Isaiah E. Hindman |
Crafton, PA |
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1,089,704
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Mar. 10, 1914
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Rail-fastening
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Isaiah E. Hindman |
Crafton, PA |
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1,093,269
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Apr. 14, 1914
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Jack
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Isaiah E. Hindman |
Crafton, PA |
An example has been seen labeled, "THE DUFF MFG CO / PITTSBURGH / PA / NO 089 / 1916 MODEL / PAT APRIL 14 1914 / X-1490 / BARRETT". |
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1,107,611
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Aug. 18, 1914
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Lever-socket for lifting-jacks
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Isaiah E. Hindman |
Crafton, PA |
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1,147,476
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Jul. 20, 1915
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Lifting-jack
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Isaiah E. Hindman |
Oakmont, PA |
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Lifting-jack
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Walter McH. Alston |
Ben Avon, PA |
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1,151,232
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Aug. 24, 1915
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Lifting-jack
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Isaiah E. Hindman |
Oakmont, PA |
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Lifting-jack
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Walter McH. Alston |
Ben Avon, PA |
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1,165,380
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Dec. 28, 1915
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Lifting-jack
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Isaiah E. Hindman |
Oakmont, PA |
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Lifting-jack
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Walter McH. Alston |
Ben Avon, PA |
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1,228,210
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May. 29, 1917
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Screw-jack
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Isaiah E. Hindman |
Bellevue, PA |
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1,234,334
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Jul. 24, 1917
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Brake mechanism for lifting-jacks
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Isaiah E. Hindman |
Bellevue, PA |
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1,316,575
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Sep. 23, 1919
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Lifting-jack
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Isaiah E. Hindman |
Bellevue, PA |
Improvement to patent 1,165,380. |
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1,323,633
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Dec. 02, 1919
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Lathe
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Isaiah E. Hindman |
Bellevue, PA |
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