David W. Pratt

Person

Clearwater, FL, US

People

Patents Grantslast 30 patents

Information Patent Grant
Bottom-emptying device for tapered bailer
- Patent number 7,255,380
- Issue date Aug 14, 2007
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Bailer having built-in filter
- Patent number 6,989,092
- Issue date Jan 24, 2006
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Dual function bailer
- Patent number 6,979,033
- Issue date Dec 27, 2005
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Self-emptying bailer
- Patent number 6,966,587
- Issue date Nov 22, 2005
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Dual function bailer
- Patent number 6,846,028
- Issue date Jan 25, 2005
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus for inhibiting contamination of sample during bailer empt...
- Patent number 6,669,255
- Issue date Dec 30, 2003
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Air-tight bailer system
- Patent number 6,601,889
- Issue date Aug 5, 2003
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Multiple check valve bailer
- Patent number 6,543,302
- Issue date Apr 8, 2003
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Bailer having leak-inhibiting seal
- Patent number 6,457,486
- Issue date Oct 1, 2002
- David W. Pratt
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
High speed insertion bailer having snap-in spider for valve alignment
- Patent number 6,457,760
- Issue date Oct 1, 2002
- David W. Pratt
- E21 - EARTH DRILLING MINING
Information Patent Grant
Controlled slow descent bailer
- Patent number 6,431,272
- Issue date Aug 13, 2002
- David W. Pratt
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ribbed filter
- Patent number D458341
- Issue date Jun 4, 2002
- David W. Pratt
- D23 - Environmental heating and cooling
Information Patent Grant
Bailer having leak-inhibiting seal
- Patent number 6,390,123
- Issue date May 21, 2002
- David W. Pratt
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Bailer having leak-inhibiting cushioned seal
- Patent number 6,286,880
- Issue date Sep 11, 2001
- David W. Pratt
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Anti-wobbling bailer with high speed insertion
- Patent number 6,167,962
- Issue date Jan 2, 2001
- David W. Pratt
- E21 - EARTH DRILLING MINING
Information Patent Grant
Bailer having leak-inhibiting seal
- Patent number 6,135,523
- Issue date Oct 24, 2000
- David W. Pratt
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Adjustable length sampler tube
- Patent number 6,058,790
- Issue date May 9, 2000
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Grant
Resealable plastic bag having venting means
- Patent number 5,996,800
- Issue date Dec 7, 1999
- David W. Pratt
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Fireplace insert
- Patent number D267583
- Issue date Jan 11, 1983
- David W. Pratt
- D23 - Environmental heating and cooling

Patents Applicationslast 30 patents

Information Patent Application
Dual Function Bailer
- Publication number 20050099030
- Publication date May 12, 2005
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Application
Apparatus for inhibiting contamination of sample during bailer empt...
- Publication number 20030160469
- Publication date Aug 28, 2003
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Application
Air-tight bailer system
- Publication number 20030075940
- Publication date Apr 24, 2003
- David W. Pratt
- E21 - EARTH DRILLING MINING
Information Patent Application
MULTIPLE CHECK VALVE BAILER
- Publication number 20030070499
- Publication date Apr 17, 2003
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Application
Dual function bailer
- Publication number 20020185878
- Publication date Dec 12, 2002
- David W. Pratt
- G01 - MEASURING TESTING
Information Patent Application
CONTROLLED SLOW DESCENT BAILER
- Publication number 20020104648
- Publication date Aug 8, 2002
- David W. Pratt
- G01 - MEASURING TESTING

David W. Pratt

Person

Patents Grantslast 30 patents

Bottom-emptying device for tapered bailer

Bailer having built-in filter

Dual function bailer

Self-emptying bailer

Dual function bailer

Apparatus for inhibiting contamination of sample during bailer empt...

Air-tight bailer system

Multiple check valve bailer

Bailer having leak-inhibiting seal

High speed insertion bailer having snap-in spider for valve alignment

Controlled slow descent bailer

Ribbed filter

Bailer having leak-inhibiting seal

Bailer having leak-inhibiting cushioned seal

Anti-wobbling bailer with high speed insertion

Bailer having leak-inhibiting seal

Adjustable length sampler tube

Resealable plastic bag having venting means

Fireplace insert

Patents Applicationslast 30 patents

Dual Function Bailer

Apparatus for inhibiting contamination of sample during bailer empt...

Air-tight bailer system

MULTIPLE CHECK VALVE BAILER

Dual function bailer

CONTROLLED SLOW DESCENT BAILER