Patent US4496954A successfully refreshed from Google Patents.
US4496954A
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Reservo interval determination in an ink jet system
Assignee: International Business Machines Corp
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Filing: 1982-12-16
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Granted: 1985-01-29
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Expires: 2002-12-16
Abstract
Abstract Optimal reservoing times of an ink jet printer are determined to be when an optimal time period exceeds a fixed maximum value, where the optimal time period is proportional: to the time since last reservoing, to the usage, and to the square of temperature changes. Specifically, the optimal time period, t-opt, is t-opt=T+mC+kKK where T=time since last reservoing, C=usage value, K=temperature changes, and m,k=empirically-determined constants.
Inventors
- 👤 John W. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:45
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
A method for improving the efficiency of operation of an ink jet printing system comprising the steps of: adjusting initially the operating parameters of the system prior to operation; determining, while the system is operating, the optimal time period between system parameter readjustments; readjusting the operating parameters of the system in accordance with the determined time period; and repeating the determining and readjusting steps during system use.
Claim 2
Independent Claim
67 words
A method for improving the efficiency of operation of an ink jet printing system comprising the steps of: adjusting initially the operating parameters of the system prior to operation; determining, while the system is operating, the optimal time period between system parameter readjustments; readjusting the operating parameters of the system in accordance with the determined time period; and repeating the determining and readjusting steps during system use.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the determining step includes a step of: calculating said optimal time period (t-opt) as T+mC+kK'2.
Claim 4
Dependent Claim
58 words
The method of claim 2 including the step of presetting a maximum reservoing interval value; wherein the determining step includes the step of comparing the maximum reservoing interval value to the optimal time period; and wherein the readjusting step is performed only if said optimal time period is greater than or equal to said maximum reservoing interval value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |