Title: Calculator apparatus with annuity switch for performing begin-and end-period annuity calculations

Abstract: A programmable electronic calculator is provided having a manually operable annuity switch with begin- and end-position settings, enabling a user to specify the type of annuity calculation to be performed. When the switch is set to the begin position, the annuity calculation is performed with payments due at the beginning of each payment period; when the switch is set to the end position, the annuity calculation is performed with payments due at the end of each payment period. The annuity calculation is performed under control of a routine stored in a read-only-memory (ROM) of a data processing unit.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Tillman, Lynn W. (Los Altos, CA, US)
Henscheid, Kent R. (Sunnyvale, CA, US)
Smith, Larry D. (Damascus, MD, US)

Application Number: 718290
Filing Date: 1976-08-27
Publication_date: 1977-10-25
Assignee: Hewlett-Packard Company (Palo Alto, CA)
Primary Class(es): 708/134 705/35
Other Classes:
US Patent Ref:

3760171	Sep, 1973	Wang et al.	340/172.
3863060	Jan, 1975	Rode et al.	235/156.
3892958	Jul, 1975	Tung	235/156.
3946218	Mar, 1976	Rode et al.	235/156.
3978328	Aug, 1976	Fabry et al.	235/156.

Other Refs:
Primary Examiner: Smith, Jerry
Assistant Examiner:
Attorney: Hulse; Robert S.