v3093-26

16

DEPARTMEN-

COMMERCE

id helmc a communication Jrom the EXAMIMCR

, of this application. / . _ JLA/^l

Philip Subkow

4 35 Roosevelt Building

Lo3 Angeles U , California

33 - Room 5087

,; James Uoon

' va 35,666

June 28, 1948

DERRICK MOUNTING FOR

PORTABLE DRILLING AND SERVICING

RIGS

This application has been examined.

Reference made of record:

rl^cEwen et al .

2.331.558

References of interest;

Dow

. '.Voody

; Flelschmann

Donley et al.

2,175,331

2.204,716

2,471,735

2,251,013

Oct. 12, 1943

Oct. 10. 1939

June 18, 1940

May 31, 1949

July 29, 1941

189-14

189-11

254-86

255-19.1

Clalns 1-5 are rejected as falling to patentably

differ froc the patent to IcEwen et al. Applicant has

merely taken UcEwen's derrick structure and reversed the

position, enclosing UcEwen's standards (7) in the cab of

lok to be raised forward of

the truck rather than to the r..ar of the truck. Appli-

cant's change of position is a matter of mechanical ex-

pedience and is not considered to involve invention.

-^,,^^l..J^J^^^

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front end, top end, 35 666, upper section, chassis front, wheels mounted, positioned adjacent, rear legs, power unit, portable drilling, lower ends, leg portions, front wheels, derrick positioned, derrick comprising

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