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Sample Business Contracts

Promissory Note - Biopure Corp. and Bing L. Wang

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                                 PROMISSORY NOTE
$70,714.82                                                         July 31, 1995

      FOR VALUE RECEIVED, the undersigned, Bing L. Wong, an individual residing
at 5 Cedar Point Road, Durham, NH 03824 (the "Obligor"), hereby absolutely and
unconditionally promises to pay to the order of BIOPURE Corporation, a Delaware
corporation ("BIOPURE"), at the office of BIOPURE located at 11 Hurley Street,
Cambridge, MA 02141, on or before July 31, 2000, the principal sum of Seventy
Thousand Seven Hundred Fourteen Dollars and Eighty-two cents ($70,714.82), with
interest thereon, or on such part thereof as shall from time to time remain
unpaid, at the Prescribed Rate, compounded annually as of December 31 of each
year.

      The Obligor has the absolute right to prepay in whole or in part the
principal of this Note and any accrued interest without penalty.

      The "Prescribed Rate" shall be, for each full or partial calendar year
during which interest shall accrue hereunder, the rate per annum equal to the
rate of interest announced by Fleet Bank of Massachusetts, N.A. as its base rate
(the "Base Rate") as in effect on January 1 of such calendar year.
Notwithstanding the previous sentence, if Fleet Bank of Massachusetts N.A. shall
announce, at any time during any such calendar year, a Base Rate that is more
than 2% higher of lower than the Base Rate in effect on January 1 of such year,
the Prescribed Rate shall be, for the remainder of such calendar year, the Base
Rate as announced from time to time during the remainder of such calendar year.

      The Obligor hereby concurrently pledges, assigns, transfers and delivers
to BIOPURE as collateral for payment and performance of all obligations under
this Note, the Obligor's interest in Biopure Associates Limited Partnership II,
a Massachusetts limited partnership representing indirect ownership of 147,000
shares of the common stock, $.0l par value, of BIOPURE, together with any
applicable assignments appropriately executed in blank. Such shares of BIOPURE
common stock and all other property of the Obligor which is now or may hereafter
be in the possession or control of BIOPURE for any purpose, together with all
additions, replacements, substitutions or proceeds thereof (all of the foregoing
being hereinafter called the "Collateral"), shall constitute continuing security
for any and all of the obligations under this Note. The holder of this Note may
at its option, whether or not this Note is due, demand, sue for, collect or make
any compromise or settlement it deems desirable with reference to any
Collateral.

      Upon the occurrence of any default by the Obligor in the payment or
performance of any of his obligations under this Note, or upon the death or
termination, whether voluntary or involuntary, with cause or without cause, for
any reason, including but not limited to disability or retirement, of the
Obligor's employment, directorial or advisory relationship with BIOPURE,
thereupon or at any time thereafter, at the option of the holder, all
obligations of the Obligor shall become immediately due and payable without
notice or demand and the
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holder of this Note shall then have in any jurisdiction where enforcement hereof
is sought, in addition to all other rights and remedies, the rights and remedies
of a secured party under the Uniform Commercial Code of Massachusetts.

      The Obligor will pay on demand all costs of collection and attorneys fees
paid or incurred by the holder hereof in enforcing the obligations of the
Obligor.

      The Obligor and all endorsers, guarantors and pledgors hereby waive
presentment, demand, notice of dishonor, protest and all other demands and
notices, in connection with the delivery, acceptance, performance, default or
enforcement of this Note, assent to any extension or postponement of the time of
payment or any other indulgence, to any substitution, exchange or release of
collateral and to the addition of release of any other party or person primarily
or secondarily liable.

      THIS NOTE SHALL BE DEEMED TO TAKE EFFECT AS A SEALED INSTRUMENT IN
ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS AND FOR ALL
PURPOSES SHALL BE GOVERNED BY AND INTERPRETED AND DETERMINED IN ACCORDANCE WITH
SUCH LAWS.

      This Note replaces a promissory note of like tenor dated August 14, 1990,
in the original principal amount of $49,100.00.

      IN WITNESS WHEREOF, the undersigned has executed this Note as of the day
and the year first above written.


                                                /s/ Bing L. Wong
                                                ------------------------
                                                Bing L. Wong