US5778067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Value transfer system
Assignee: Mondex International Ltd
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Filing: 1996-06-17
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Granted: 1998-07-07
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Expires: 2016-06-17
Abstract
Abstract A value transfer system which allows value to be transferred between electronic purses comprises computer which controls the loading of purses with value and the redemption of value from purses, a special bulk purse or purses and a value meter securely linked thereto which registers the total net value issued to the bulk purse or purses. Draw-down of value and redemption of value transactions are effected with the bulk purses.
Inventors
- 👤 Timothy Lloyd Jones
- 👤 Graham Robert L. Higgins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1008; G06; G06Q; G06Q20/00; G06Q20/02; G06Q20/04; G06Q20/06; G06Q20/08; G06Q20/10; G06Q20/105; G06Q20/20; G06Q20/204; G06Q20/30; G06Q20/34; G06Q20/341; G06Q20/36; G06Q20/367; G06Q20/3676; G06Q20/38; G06Q20/382; G06Q20/3829; G06Q20/40; G06Q20/401; G06Q20/409; G06Q20/4097; G06Q20/40975
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A value transfer system, said system comprising: a computer system; a plurality of electronic purses; at least one exchange device whereby said purses communicate with each other to transfer value in transactions which are off-line from the computer system; and a cryptographic key system under which communication between purses is effected, each purse storing one or more cryptographic keys and including a microprocessor, wherein, in a transaction between a first purse having a microprocessor of a first computing power and a second purse having a microprocessor of a second computing power, said first power being superior to said second power, the microprocessors are programmed to send to the first purse a secret key of the second purse.
Claim 2
Dependent Claim
117 words
A value transfer system, said system comprising: a computer system; a plurality of electronic purses; at least one exchange device whereby said purses communicate with each other to transfer value in transactions which are off-line from the computer system; and a cryptographic key system under which communication between purses is effected, each purse storing one or more cryptographic keys and including a microprocessor, wherein, in a transaction between a first purse having a microprocessor of a first computing power and a second purse having a microprocessor of a second computing power, said first power being superior to said second power, the microprocessors are programmed to send to the first purse a secret key of the second purse.
Claim 3
Dependent Claim
87 words
A value transfer system as claimed in claim 1 in which the first purse stores its own unique public/secret key pair in the cryptographic system, and wherein said step of sending to the first purse a secret key of the second purse is preceded by the step of sending to the second purse the public key of the first purse, and wherein the secret key of the second purse is encrypted using the public key of the first purse prior to being sent to the first purse.
Claim 4
Dependent Claim
42 words
A value transfer system as claimed in claim 2 wherein the transaction includes the subsequent steps of encrypting, in said first purse, a transaction message using the secret key of said second purse and sending the encrypted message to the second purse.
Claim 5
Dependent Claim
47 words
A value transfer system as claimed in claim 3 in which the second purse stores its own unique public/secret key pair in the cryptographic system, said transaction including the step of decrypting, in said second purse, the transaction message using the public key of the second purse.
Claim 6
Dependent Claim
48 words
A value transfer system as claimed in claim 3 in which the secret key of the second purse takes the form of an encryption key for a symmetrical cryptographic system, said transaction including the step of decrypting in said second purse, the transaction message using the encryption key.
Claim 7
Dependent Claim
42 words
A value transfer system as claimed in claim 1 wherein the transaction includes the subsequent steps of encrypting, in said first purse, a transaction message using the secret key of said second purse and sending the encrypted message to the second purse.
Claim 8
Dependent Claim
47 words
A value transfer system as claimed in claim 6 in which the second purse stores its own unique public/secret key pair in the cryptographic system, said transaction including the step of decrypting, in said second purse, the transaction message using the public key of the second purse.
Claim 9
Dependent Claim
48 words
A value transfer system as claimed in claim 6 in which the secret key of the second purse takes the form of an encryption key for a symmetrical cryptographic system, said transaction including the step of decrypting in said second purse, the transaction message using the encryption key.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |