US5689676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential EEPROM writing apparatus which sequentially and repetitively replaces a head position pointer with a last position pointer
Assignee: Sony Corp
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Filing: 1996-11-18
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Granted: 1997-11-18
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Expires: 2016-11-18
Abstract
Abstract A storage device incorporating an electrically erasable read only memory (EEPROM) or other data storage device having a limited number of total times of rewriting, has its useful like extended by the method of storing a pointer corresponding to the capacity of the memory, which pointer identifies a start position in the data storage device at which rewriting is to occur, and incrementing the pointer sequentially with each writing of the data storage device. The method and associated apparatus may be used to maintain a record of on-time of electronic apparatus, and/or to maintain data for correcting the white balance of a video camera under various light conditions.
Inventors
- 👤 Harumi Hirose
- 👤 Toshizumi Ando
- 👤 Yoshiki Takekawa
- 👤 Toshiaki Isogawa
- 👤 Shingo Nakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:31
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/10; G11C16/102; G11C16/105; G11C16/34; G11C16/349; G11C16/3495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
An apparatus for storing data in memory device having a finite total number of writings comprising: a data memory having a plurality of data areas for storing data; a pointer memory for storing pointer information corresponding to said plurality of data areas, said pointer information identifying a beginning data area and wherein said pointer information is sequentially ordered from a head position pointer to a last position pointer; and a control means for identifying a start in said pointer memory by said head position pointer and writing and changing the contents of said pointer memory sequentially and repetitively by replacing said head position pointer with a last position pointer.
Claim 2
Independent Claim
109 words
An apparatus for storing data in memory device having a finite total number of writings comprising: a data memory having a plurality of data areas for storing data; a pointer memory for storing pointer information corresponding to said plurality of data areas, said pointer information identifying a beginning data area and wherein said pointer information is sequentially ordered from a head position pointer to a last position pointer; and a control means for identifying a start in said pointer memory by said head position pointer and writing and changing the contents of said pointer memory sequentially and repetitively by replacing said head position pointer with a last position pointer.
References Cited (Backward Citations)
US4064558A
Cited
GB2029147A
Cited
US4638430A
Cited
US4814972A
Cited
US4718038A
Cited
US5093785A
Cited
US4783737A
Cited
US4812868A
Cited
US4841322A
Cited
US4862200A
Cited
US4924253A
Cited
US4855842A
Cited
US4920369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |