The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 1991
Filed:
Jan. 30, 1989
Applicant:
Inventor:
Steven J Frank, Brookline, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ; G06F / ;
U.S. Cl.
CPC ...
364525 ; 36470501 ; 364706 ;
Abstract
A darkroom calculator that performs mass, volume, concentration and temperature conversions useful in the preparation of darkroom chemicals; calculation of proper development times and temperatures for exposed film; calculation of proper dilution temperatures; calculation of exposure values relevant to the enlargement process and exposure of sensitized substrates; and monitoring of the passage of time and solution temperature levels.