Sample Business Contracts

Promissory Note - Biopure Corp. and Geoffrey Filbey

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                                 PROMISSORY NOTE

$47,707.30                                                         July 31, 1995

      FOR VALUE RECEIVED, the undersigned, Geoffrey Filbey, an individual
residing at 51 Broad Reach M15A, North Weymouth, MA 02190 (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 Forty-seven Thousand Seven Hundred Seven Dollars and Thirty
Cents ($47,707.30), 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 or 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 125,500
shares of the common stock, $.01 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

      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

      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 replaces a promissory note of like tenor dated August 14, 1990,
in the original principal amount of $33,125.00.

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

                                                /s/ Geoffrey Filbey
                                                Geoffrey Filbey
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                                                             51 Broad Reach M15A
                                                        North Weymouth, MA 02190

                                                                December 8, 1995

Biopure Associates Limited Partnership II
 and Biopure Corporation
11 Hurley Street
Cambridge, MA 02141


            Delivered herewith to Biopure Corporation is a restated Promissory
Note dated as of July 31, 1995, given in exchange for the note of the
undersigned dated August 8, 1990 (the "Original Note"). The undersigned has been
offered the opportunity either (1) to pay the Original Note in full and receive
a distribution from Biopure Associates Limited Partnership II ("BALP II") of
Biopure Corporation Common Stock ("Shares") contributed to BALP II and
indirectly securing payment of the Original Note or (2) to extend the obligation
of the undersigned by executing and delivering the enclosed replacement note and
agreeing to an amendment to the BALP II limited partnership agreement in the
form attached hereto, with the effect that the Shares will remain in BALP II for
an additional five years.

            The undersigned hereby agrees to the Amendment of the Agreement of
Limited Partnership of BALP II in the form attached to this letter and
authorizes Brian Lajoie and Carl Rausch, or either of them, to execute and
deliver such Amendment as attorney-in-fact for the undersigned.

                                                Very truly yours,

                                                /s/ Geoffrey Filbey

                                                Geoffrey Filbey