Inventor
V. Walter Hafner
Inventor
Whittier, CA, US
Overview
Patents· 28 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Cprimary
C07CAcyclic or carbocyclic compounds20%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%
F16KValves9%
Y10TTechnical subjects covered by former us classification9%
E03CDomestic plumbing installations for fresh water or waste water7%
E03FSewers7%
A23KFodder4%
A47KSanitary equipment4%
E03DWater-closets or urinals with flushing devices4%
F24FAir-conditioning4%
PatentTitleYear
7,148,379'Preparation of 2-hydroxy-4-methylthiobutyric acid'20066,990,993'Vacuum drainage system'20066,566,559'Process for the production of isopropenyl methyl ether'20036,394,411'Extractor valve assembly'20026,316,661'Process for the production of 2,3,5-trimethylhydroquinone diesters'20016,311,718'Activator valve for providing a timed vacuum at an output port'20016,146,612'Method for recovering sulfuric acid from sulfate salts'20006,140,536'Process for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA)'20006,008,409'Method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is stable in storage'19995,976,609'Process for recovering 2-hydroxy-4-methylthiobutyric acid (MHA), MHA and its use'1999D0411876'Wash basins'19995,847,207'Process for producing 2-hydroxy-4-methylthiobutyric acid (MHA) and its use as feed stuff supplement'19985,067,181'Blow out toilet with low water volume usage'19914,698,860'Sprayhead with built-in soap system for multi person washfountains'19874,682,533'Vandal resistant and tamper proof pneumatic push button assembly for moving a volume of fluid'19874,630,644'Dual operated metering valve connected to both a hand operated push button and a foot operated push button'19864,630,638'Rotating cap, screen and mounting means for protecting air metering valve'19864,580,300'Combined wall construction form and plumbing fixture mounting device for fire rated wall construction'19864,571,901'Vandal-resistant security view port'1986D0281714'Tamper-proof lavatory and toilet unit'19854,512,241'Plenum/vacuum chamber with duct connection for installation in cabinet of fixture to control air supply or return'19854,505,189'Vandal-resistant and tamper-proof plenum or vacuum chamber security air flow adjustment device'19854,492,430'Security mirror replaceable from pipe chase'19854,462,123'Fabricated floor drain with large stepped flange for elastomeric trowelled covering'19844,434,516'Wall sleeve and installation jig for multiple adjacent fixture mounting'19844,423,527'Fabricated floor drain with combination anchoring and seepage control flange'19844,307,037'Process for the production of iminodiacetonitrile'19814,157,300'Process for the purification of phenol and phenol formaldehyde containing waste water'1979Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1979–2006Patents assigned to DEGUSSA (10)· patent assignee history
1979Based in Frankfurt am Main, DE· patent location history
1981–2006Based in Langenselbold, DE· patent location history
1984–2006Patents assigned to ACORN ENG CO (15)· patent assignee history
1984Patents assigned to ACORN ENGINEERING (1)· patent assignee history
1984–2006Based in Whittier, CA, US· patent location history
1985Patents assigned to HAFNER V WALTER (1)· patent assignee history
2000Based in Langenselbod, DE· patent location history
2002Patents assigned to ACORNVAC INC (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| ACORN ENG CO | 15 | 1984–2006 |
| DEGUSSA | 10 | 1979–2006 |
| ACORN ENGINEERING | 1 | 1984 |
| ACORNVAC INC | 1 | 2002 |
| HAFNER V WALTERself | 1 | 1985 |
Locations
| Location | Patents | Span |
|---|---|---|
| Whittier, California, US | 18 | 1984–2006 |
| Langenselbold, DE | 8 | 1981–2006 |
| Langenselbod, DE | 1 | 2000 |
| Frankfurt am Main, DE | 1 | 1979 |