David J Marchetti

US Patent:

6464816, Oct 15, 2002

Filed:

Aug 4, 1998

Appl. No.:

09/128770

Inventors:

Michael DeFrank - Temecula CA
David Marchetti - San Diego CA
David L. Teegardin - San Diego CA

Assignee:

T-Systems International, Inc. - San Diego CA

International Classification:

B29C 5348

US Classification:

156203, 156252, 156466, 156513

Abstract:

A drip irrigation hose of the continuous emitter type in which the outlets from the regulating passage each comprise a single longitudinal slit. By controlling the length of the slits and the flexibility of the film, water drips from the outlets when the hose is pressurized without clogging when the hose is depressurized. The slits are sufficiently long and the film is sufficiently flexible so the water drips from the outlets when the hose is pressurized. The slits are sufficiently short and the film is sufficiently rigid so the outlets close completely when the hose is depressurized. An outlet forming wheel has a knife blade on its periphery. A backing wheel engages the outlet forming wheel to establish a first nip therebetween. The backing wheel has on its periphery a circumferential slot into which the knife blade fits at the first nip. A rib forming wheel has around its periphery impressions that define a desired track pattern for the ribs.

US Patent:

6936126, Aug 30, 2005

Filed:

Jul 11, 2002

Appl. No.:

10/192959

Inventors:

Michael DeFrank - Temecula CA, US
David Marchetti - San Diego CA, US
David L. Teegardin - San Diego CA, US

Assignee:

T-Systems International, Inc. - San Diego CA

International Classification:

B29C053/48

US Classification:

156203, 156252

Abstract:

A drip irrigation hose of the continuous emitter type in which the outlets from the regulating passage each comprise a single longitudinal slit. By controlling the length of the slits and the flexibility of the film, water drips from the outlets when the hose is pressurized without clogging when the hose is depressurized. The slits are sufficiently long and the film is sufficiently flexible so the water drips from the outlets when the hose is pressurized. The slits are sufficiently short and the film is sufficiently rigid so the outlets close completely when the hose is depressurized. An outlet forming wheel has a knife blade on its periphery. A backing wheel engages the outlet forming wheel to establish a first nip therebetween. The backing wheel has on its periphery a circumferential slot into which the knife blade fits at the first nip. A rib forming wheel has around its periphery impressions that define a desired track pattern for the ribs.

US Patent:

55225519, Jun 4, 1996

Filed:

Jul 19, 1994

Appl. No.:

8/279813

Inventors:

Michael DeFrank - Temecula CA
David Marchetti - San Diego CA
David L. Teegardin - San Diego CA

Assignee:

T-Systems International, Inc. - San Diego CA

International Classification:

B05B 1500
B29C 5348

US Classification:

239542

Abstract:

A drip irrigation hose of the continuous emitter type in which the outlets from the regulating passage each comprise a single longitudinal slit. By controlling the length of the slits and the flexibility of the film, water drips from the outlets when the hose is pressurized without clogging when the hose is depressurized. The slits are sufficiently long and the film is sufficiently flexible so the water drips from the outlets when the hose is pressurized. The slits are sufficiently short and the film is sufficiently rigid so the outlets close completely when the hose is depressurized. An outlet forming wheel has a knife blade on its periphery. A backing wheel engages the outlet forming wheel to establish a first nip therebetween. The backing wheel has on its periphery a circumferential slot into which the knife blade fits at the first nip. A rib forming wheel has around its periphery impressions that define a desired track pattern for the ribs.

US Patent:

56345950, Jun 3, 1997

Filed:

May 20, 1996

Appl. No.:

8/650469

Inventors:

Michael DeFrank - Temecula CA
David Marchetti - San Diego CA
David L. Teegardin - San Diego CA

Assignee:

T-Systems International, Inc. - San Diego CA

International Classification:

B05B 1500

US Classification:

239542

Abstract:

A drip irrigation hose of the continuous emitter type in which the outlets from the regulating passage each comprise a single longitudinal slit. By controlling the length of the slits and the flexibility of the film, water drips from the outlets when the hose is pressurized without clogging when the hose is depressurized. The slits are sufficiently long and the film is sufficiently flexible so the water drips from the outlets when the hose is pressurized. The slits are sufficiently short and the film is sufficiently rigid so the outlets close completely when the hose is depressurized. An outlet forming wheel has a knife blade on its periphery. A backing wheel engages the outlet forming wheel to establish a first nip therebetween. The backing wheel has on its periphery a circumferential slot into which the knife blade fits at the first nip. A rib forming wheel has around its periphery impressions that define a desired track pattern for the ribs.