Noel M Calvin

42556996, Mar 10, 1981

Apr 19, 1979

6/031417

Noel M. Calvin - Berkeley CA

G05F 500

323322

An apparatus for applying AC power to a load while maintaining a minimum charge across a capacitor for use as a DC power supply, that may be connected in series with the power supply and load, and does not require a parallel connection to the power supply, including power control means responsive to the phase of the power supply signal such that the voltage across said power control means is allowed to rise to a given voltage each cycle, before power is applied to the load, and charging means operable to charge said capacitor to said given voltage.

50988433, Mar 24, 1992

Jul 9, 1990

7/549957

Noel M. Calvin - Los Altos CA

C12N 1300
C12N 1500

435287

Apparatus and methodology for the transformation of living cells by the introduction of DNA thereto through transient pores created in the cell walls by the highly efficient electroporation of such cells in a liquid suspension with DNA. High efficiency electroporation is accomplished by the generation of a high voltage electrical pulse with precise characteristics determined necessary to optimize cell transformation and the application of such pulse to a sample of such suspension or by continuous flow of the suspension through a static electrical field under flow conditions to simulate the precise characteristics of such high voltage pulse. Thus, the suspension, whether treated as a non-flowing sample or as a continuous flow liquid suspension of cells in admixture with DNA, is subjected to a high intensity electric field at its maximum intensity in no more than about 100 microseconds and thereafter to reduced field intensity to zero field intensity in no more than about 5,000 microseconds. The high intensity pulse, or static electrical field with suspension flow therethrough simulating the characteristics of such pulse, porates the wall of the cells in suspension thereby allowing the introduction of DNA into the cells with a high survival rate for such cells.

51216302, Jun 16, 1992

Dec 21, 1990

7/633031

Noel M. Calvin - Los Altos CA

G01N 2722
A61B 1900
G08B 2100

73 73

The present invention is directed to devices for detecting the moisture content of material such as a diaper using a change in bulk dielectric constant. More particularly, the invention relates to a moisture sensing device which provides an accurate indication of the moisture content of a material such as a diaper when merely placed in the vicinity of the diaper. In a preferred embodiment, the device is a hand-held device which can be readily transported and which can detect diaper moisture without piercing the diaper or attaching electrodes directly to the diaper.

43131182, Jan 26, 1982

Jun 30, 1980

6/164805

Noel M. Calvin - Berkeley CA

G01S 1304
H01Q 126

343701

An improved microwave proximity sensor including 1/4-wavelength folded dipole antenna performing the functions of a transmitting antenna, a receiving antenna, and a frequency determining element in a microwave oscillator.

41227514, Oct 31, 1978

Apr 8, 1977

5/786008

Noel M. Calvin - Berkeley CA

G10G 702

84454

Switching means for automatically determining which note in the entire musical spectrum is closest to an input frequency and display means for generating a visual display of the frequency difference between said input signal and the correct frequency of said note, specifically adapted for the tuning of musical instruments.

43451675, Aug 17, 1982

Jan 18, 1980

6/113867

Noel M. Calvin - Berkeley CA

G08B 1326

307308

A method for detecting the change in the capacitance of an antenna caused by the approach of a person to the antenna, including the step of charging said antenna to a predetermined voltage relative to ground or a reference antenna, the step of discharging the antenna through a capacitor such that the voltage developed across the capacitor is proportional to the initial charge on the antenna, said charging and discharging steps being sequentially repeated, and the step of comparing the instantaneous voltage across the capacitor to the long term average voltage to detect transient changes caused by an increase in the antenna capacitance resulting from the approach of a person.

46528644, Mar 24, 1987

Jul 26, 1982

6/401925

Noel M. Calvin - Portola Valley CA

G08B 1318

340553

Microwave oscillator means wherein the resonant frequency determining element is a 1/2 or 1/4-wavelength folded dipole antenna that also serves as the transmitting and receiving antenna, capacitor means that is alternately charged and then discharged through said oscillator means until the voltage drops so low that oscillation ceases at which point the capacitor is charged again, negative peak follower means to convert the minimum voltage across the capacitor into a DC voltage, and comparator means to detect changes in the output voltage of the peak follower caused by the approach of a person or object to the 1/2 or 1/4-wavelength antenna.

40784690, Mar 14, 1978

Mar 19, 1976

5/668626

Noel Morgen Calvin - Berkeley CA

G04B 108
A63J 1700
G09B 1502
G01R 2314

84454

Display means for electronically generating a visual display of the frequency difference between two frequencies, adaptable for the tuning of musical instruments. In the exemplary body of said adaptation the note from the instrument is picked up through a microphone and fed through electronic means for isolating the fundamental frequency; the frequency and a reference frequency generated by a reference frequency synthesizer are fed into said display means which generates a visual display of the frequency difference between said fundamental frequency and said reference frequency.