Douglas G. Ryan has been granted 13 US patents while listed as an inventor at ExxonMobil . The first was granted in 1980 and the most recent in February 1990. Douglas G. Ryan ranks #362,438 of 4,157,543 US inventors in our database (top 8.7%). Patent records list Douglas G. Ryan in Rockaway, NJ, US.
Patents per Year Patents granted per year, 1980 to 1990 Bar chart with a peak of 3 patents in 1982. peak 3 1980: 2 patents 1980 1982: 3 patents 1982 1984: 1 patents 1984 1985: 1 patents 1985 1986: 3 patents 1986 1987: 1 patents 1987 1989: 1 patents 1989 1990: 1 patents 1990
Issued Patents All Time
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Showing 1–13 of 13 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
4904367 Removing haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil range Donald B. Trust 1990-02-27
$26,313,000
4820400 Process for removing haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil range (OP-3379) Donald B. Trust , Rudolph R. Savory 1989-04-11
$36,347,000
4702817 Removing haze from hydrocarbon oil mixture boiling in the lubricating oil range Steven Ackerman 1987-10-27
$52,841,000
4629546 Method and apparatus for centrifugal separation of dispersed phase from a continuous liquid phase — 1986-12-16
$34,579,000
4627901 Separating wax from hydrocarbon mixture boiling in the lubricating oil range Anthony E. Cerkanowicz , Robert J. L. Chimenti , Donald J. Mintz 1986-12-09
$54,571,000
4622118 Method and apparatus for separating wax/water from hydrocarbon oil mixture boiling in the lubricating oil range Robert J. L. Chimenti , Anthony E. Cerkanowicz 1986-11-11
$53,993,000
4512878 Used oil re-refining Lloyd E. Reid , Keith C. Yao 1985-04-23
$18,242,000
4490240 Removal of corrodants from NMP solvent by contacting with sacrificial metal Roy V. Comeaux , Milton D. Leighton 1984-12-25
4346008 Rotary drum filter Milton D. Leighton 1982-08-24
$16,188,000
4314886 Mechanically agitated liquid-vapor contacting apparatus — 1982-02-09
$96,399,000
4309288 Rotary drum filter Derek J. Watridge 1982-01-05
$20,929,000
4217203 Continuous autorefrigerative dewaxing process and apparatus — 1980-08-12
$20,763,000
4216075 Combination dewaxing process — 1980-08-05
