Gerald E Petersen

US Patent:

40501728, Sep 27, 1977

Filed:

Apr 7, 1975

Appl. No.:

5/565776

Inventors:

Gerald A. Petersen - San Francisco CA

International Classification:

E02F 928

US Classification:

37142A

Abstract:

A retainer of generally U-shape having slightly diverging legs detachably secures the proximal part of an excavating tooth within a complementary recess in its holder. The proximal end of the tooth has a generally rectangular cross-section with opposed outward extending ears and rearwardly thereof is formed with a spindle having a shoulder at the back. In the operative position of the retainer, a portion of the retainer straddles the spindle immediately in front of the shoulder. At least one leg of the retainer is formed with an upper offset leg portion and with oppositely offset lower leg portion with an interconnection there-between. The upper offset portion fits ahead of the shoulder to retain the tooth in place when the retainer is in operative position; but when the retainer is retracted to inoperative position, the upper offset portion of the leg clears the shoulder of the spindle of the tooth. The tooth holder is formed with an opening in which the retainer slides and the opening has an inward protuberance which engages the connecting portion to prevent unintentional complete withdrawal of the retainer so that it is not lost when it has been moved to retracted position. An improved distal tooth shape is disclosed wherein the blade has a body of substantially uniform thickness from front to rear with a central rib whereby the tooth remains sharp during its life.

US Patent:

44398581, Mar 27, 1984

Filed:

May 28, 1981

Appl. No.:

6/267734

Inventors:

Gerald W. Petersen - Walnut Creek CA

Assignee:

Zehntel, Inc. - Walnut Creek CA

International Classification:

G01R 3128
G06F 1100

US Classification:

371 20

Abstract:

A circuit adapted for use in a high speed computer controlled digital in-circuit tester for obtaining high pulse fidelity at each electrical node of a circuit under test is provided. High pulse fidelity is obtained by minimizing the current in the power supply and digital test signal current loops for the components of the circuit under test. The tester includes a plurality of programmed memory digital test-signal generators responsive to the computer for generating and supplying to the nodes of the circuit under test a complex sequence of digital logic signals. The circuit also includes a plurality of distributed programmable power sources, each power source associated with at least one of said test signal generators, for generating the power supply voltages for the components. The power supply voltages for the components under test are obtained from the programmable power sources associated with the test signal generators involved in generating and supplying the test signals to those components, thereby localizing the component power supply current loops and the driving digital test signal current loops.

US Patent:

41331966, Jan 9, 1979

Filed:

Sep 8, 1977

Appl. No.:

5/831439

Inventors:

Gerald A. Petersen - San Mateo CA

International Classification:

A44B 1500

US Classification:

70457

Abstract:

A key chain comprises a long chain of oblong links having one link of a length longer than the other links extending outward from a fitting formed with a cross-shaped aperture to permit movement of the chain through the aperture. The aperture has a slot extending out to an edge of the fitting. Only the elongated chain link will slide through the slot. Attached to the fitting is a medallion which may carry an advertising logo, owner identification data or other information or decoration. The outer end of the chain has a finger grip to facilitate grasping the chain to move the chain through the aperture until the elongated link is opposite the slot.

US Patent:

43676022, Jan 11, 1983

Filed:

Oct 13, 1981

Appl. No.:

6/310472

Inventors:

Gerald A. Petersen - Moraga CA

International Classification:

E02F 928

US Classification:

37142A

Abstract:

Two staple-like spring metal parts designated "lock" and "key" are provided to retain an excavating tooth in a holder. The lock part slides into an opening in the holder for the tooth around a reduced diameter portion of the shank of the tooth and thereby prevents withdrawal of the tooth by interfering with the outward movement of a button on the extreme end of the shank. The legs of the lock are biased outwardly by reason of the unstressed shape of the lock. These outwardly biased legs are forced inward by insertion in the opening of a key which fits outward of the lock and forces the legs of the lock inward into locked position, engaging a portion of the shank. When the key is removed, it provides space for outward movement of the legs of the lock and thereby prevents a tendency of dirt compacting in the opening of the holder from preventing withdrawal of the lock.