David Chase

US Patent:

20020130716, Sep 19, 2002

Filed:

Mar 14, 2001

Appl. No.:

09/808908

Inventors:

Lawrence Larson - Del Mar CA, US
Robert Hammond - Santa Barbara CA, US
Balam Willemsen - Ventura CA, US
David Chase - Santa Barbara CA, US
Peter Asbeck - San Diego CA, US

International Classification:

H03F001/26

US Classification:

330/151000

Abstract:

In a reduced-distortion bandpass filtering circuit, and method, a small portion, normally -20 db, of an input signal, normally narrowband rf, is fed forward while a major signal portion is filtered in a first bandpass filter, inducing distortion. The small portion fed forward is itself bandpass filtered in a second bandpass filter, preferably identical to the first. Because the signal level is lower, less distortion is produced. The second-bandpass-filtered small portion is subtracted from yet another small, -20 db, portion now fed forward from the first-bandpass-filtered signal, distortion and all. Undistorted parts of the two signals cancel, isolating the signal distortion. This distortion is amplified and adjusted in phase, and then subtracted from the first-bandpass-filtered signal, producing a signal in which substantially all distortion induced by filtering in the first bandpass filter is canceled. Bandpass filters having (i) low insertion loss and narrow bandwidth but (ii) high nonlinearity as induces distortion, notably of the high temperature superconductor types, may thus be used to better advantage, particularly in a power combining network of diplexor.

US Patent:

20020130729, Sep 19, 2002

Filed:

Mar 14, 2001

Appl. No.:

09/808913

Inventors:

Lawrence Larson - Del Mar CA, US
Robert Hammond - Santa Barbara CA, US
Balam Willemsen - Ventvna CA, US
David Chase - Santa Barbara CA, US
Peter Asbeck - San Diego CA, US

International Classification:

H01P001/20
H01B012/02

US Classification:

333/09900S, 333/202000, 505/210000

Abstract:

In a bandpass filter circuit usable at the front end of a cellular microwave radio receiver, and particularly suitable for implementation with high temperature superconductor transmission lines, an rf input signal is split in a first coupler into a major first portion and a minor second portion. A first bandpass filter of inevitable non-linearity receives the first signal portion and produces therefrom a first-bandpass-filtered signal having distortion products collectively of a first power. A second bandpass filter having substantially identical passband and noise characteristics to, but with a non-linearity much greater than, the first bandpass filter receives the second signal portion of the input signal and produces therefrom a second-bandpass-filtered signal which has distortion products substantially collectively equal to the first power. A phase reverser reverses the phase of the second-bandpass-filtered signal relative to the first-bandpass-filtered signal, and the signals are coupled in a second coupler to produce a bandpass-filtered output signal in which the distortion products are substantially canceled. The first-bandpass-filtered is preferably amplified in first low noise amplifier, and the second-bandpass-filtered amplified in a second low noise amplifier of variable gain as well as being phase reversed in a phase reverser of variable phase, both so as to (i) “fine tune” the circuit, and (ii) overcome a slight trade-off that is made in the sensitivity of the bandpass filter circuit to the input signal.

US Patent:

20080009814, Jan 10, 2008

Filed:

Jul 10, 2006

Appl. No.:

11/456402

Inventors:

Michelle Bartning - San Francisco CA, US
Kevin F. Gironda - Schwenksville PA, US
Mari Hou - Hoboken NJ, US
Thomas P. Luchino - Freehold NJ, US
Kirsten Freislinger Luehrs - Palo Alto CA, US
Pramod Mavinkurve - Princeton NJ, US
Leonard Rosenfeld - Yardley PA, US
Raymond J. Hull - Hampton NJ, US
David J. Chase - Somerville NJ, US

International Classification:

A61F 5/44

US Classification:

604330, 600 29

Abstract:

A urinary incontinence device includes a working portion having an insertion equivalent diameter ranging from about 10 to about 25 mm and a use equivalent diameter ranging from about 25 to about 35 mm under an expansion pressure of about 20 to about 150 cm HO.

US Patent:

20080009931, Jan 10, 2008

Filed:

Jul 10, 2006

Appl. No.:

11/456390

Inventors:

MICHELLE BARTNING - San Francisco CA, US
Kevin F. Gironda - Schwenksville PA, US
Mari Hou - Hoboken NJ, US
Thomas P. Luchino - Freehold NJ, US
Kristen Freislinger Luehrs - Palo Alto CA, US
Pramod Mavinkurve - Princeton NJ, US
Leonard Rosenfeld - Yardley PA, US
Raymond J. Hull - Hampton NJ, US
David J. Chase - Somerville NJ, US

International Classification:

A61F 2/00

US Classification:

623 11

Abstract:

A device includes a somewhat cylindrical working portion having an initial equivalent diameter ranging from about 20 to about 170 mm, an insertion equivalent diameter ranging from about 5 to about 25 mm, a use equivalent diameter ranging from about 20 to about 40 mm and a length ranging from about 20 to about 60 mm; and an anchoring portion extending beyond the working portion and having an initial equivalent diameter ranging from about 20 to about 60 mm, an insertion equivalent diameter ranging from about 10 to about 25 mm, a use equivalent diameter ranging from about 20 to about 60 mm and a length ranging from about 10 to about 50 mm.

US Patent:

20080033230, Feb 7, 2008

Filed:

Jul 11, 2007

Appl. No.:

11/776178

Inventors:

Michelle Bartning - San Francisco CA, US
Kevin Gironda - Schwenksville PA, US
Mari Hou - Hoboken NJ, US
Thomas Luchino - Freehold NJ, US
Kirsten Luehrs - Palo Alto CA, US
Pramod Mavinkurve - Princeton NJ, US
Leonard Rosenfeld - Yardley PA, US
Raymond Hull - Hampton NJ, US
David Chase - Somerville NJ, US

International Classification:

A61F 2/50

US Classification:

600029000

Abstract:

An intravaginal device has a working portion (e.g., intravaginal urinary incontinence device suppository, tampon) and an anchoring portion comprising at least one member extending beyond at least one end of the working portion to maintain the working portion in place during use.