Patent US3921042A successfully refreshed from Google Patents.
US3921042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic reproduction machine with improved corona generating device
Assignee: Xerox Corp
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Filing: 1974-11-25
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Granted: 1975-11-18
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Expires: 1994-11-25
Abstract
Abstract An electrostatic reproduction machine has a DC biased AC corona generating device, the device having a metal shield which is grounded through an AC bypass capacitor which permits AC current to be shunted to the ground while preventing DC current from being shunted.
Inventors
- 👤 Vittal U Shenoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:04
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; G03G15/6535; G03G15/02; G03G15/14; G03G15/16; G03G15/163; G03G15/1635
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
An improved electrostatic reproduction machine haviNg means including a transfer station and a stripping station for producing a copy of an original document, the improvement comprising a DC biased AC corona generating device having a metal shield, and means for grounding the metal shield, the grounding means including means for allowing AC current to be grounded while simuntaneously blocking DC current.
Claim 2
Dependent Claim
61 words
An improved electrostatic reproduction machine haviNg means including a transfer station and a stripping station for producing a copy of an original document, the improvement comprising a DC biased AC corona generating device having a metal shield, and means for grounding the metal shield, the grounding means including means for allowing AC current to be grounded while simuntaneously blocking DC current.
Claim 3
Dependent Claim
18 words
An improved electrostatic reproduction machine according to claim 1, wherein the grounding means includes an AC bypass capacitor.
Claim 4
Dependent Claim
21 words
An improved electrostatic reproduction machine according to claim 2, wherein the stripping station includes the DC biased AC corona generating device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |