H-TECH, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2004/0074,024 Suction-type cleaning device for submerged surfacesAbandonedOct 19, 02Apr 22, 04[E04H]
6287462 Alternate sanitizer for sand filterExpiredMar 29, 99Sep 11, 01[B01D]
6254788 Method of sanitizing water in a bathing poolExpiredOct 28, 99Jul 03, 01[C02F, B01D]
6221321 Chemical feederExpiredNov 12, 98Apr 24, 01[B01D]
5993753 Chlorinator/sanitizer and method of using sameExpiredFeb 11, 98Nov 30, 99[B01D]
5882528 Method for extending useful life of filter aid in a filter with hydraulically deformable systemExpiredOct 24, 96Mar 16, 99[B01D]
5871641 Fluid filter with pleated septumExpiredNov 25, 97Feb 16, 99[B01D]
5609185 Valve indicator and handle assemblyExpiredMay 31, 95Mar 11, 97[F16K]
5604950 Anti-clogging, variable throat suction nozzle and suction cleaning device equipped therewithExpiredOct 27, 95Feb 25, 97[A47L, E04H]
5591329 Fluid filter with pleated septumExpiredMay 31, 95Jan 07, 97[B01D]
5587074 Fluid filter with enhanced backflush flowExpiredFeb 17, 95Dec 24, 96[B01D]
5551467 Ball valve with controlled flow variationExpiredAug 11, 95Sep 03, 96[F16K]
5542714 Adapter for coupling a pair of pipe elementsExpiredApr 28, 95Aug 06, 96[F16L]
5507058 Automatic pool cleaning apparatusExpiredJan 13, 95Apr 16, 96[F04H]
5435031 Automatic pool cleaning apparatusExpiredJul 09, 93Jul 25, 95[E04H]
5418994 Underwater surface cleaning apparatusExpiredOct 25, 93May 30, 95[E04H]
5396677 Underwater cleaning deviceExpiredOct 25, 93Mar 14, 95[E04H]
5358638 Multiple layer filter bag including abrasion-resistant materialExpiredAug 27, 93Oct 25, 94[B01D]
5341847 Underwater cleaning apparatusExpiredOct 25, 93Aug 30, 94[F16K]
D333341 Multi-port valve handleExpiredApr 30, 91Feb 16, 93[]

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