US3351340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Document transport for photocopy machine
Assignee: American Photocopy Equipment Co
•
Filing: 1964-06-30
•
Granted: 1967-11-07
•
Expires: 1984-06-30
Abstract
No abstract record available.
Inventors
- 👤 Franklin R Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/602
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
IN AN ELECTROSTATIC PHOTOCOPY MACHINE OR THE LIKE REQUIRING TRANSPORT OF AN ORIGINAL SHEET ALONG A CURVED PATH OF TRANSPORT, THE COMBINATION COMPRISING A FRAME, A CYLINDRICAL DRUM GROUNDED TO AND JOURNALLED IN THE FRAME AND HAVING MEANS FOR DRIVING THE SAME, AN INSULATING BLANKET ON THE DRUM, MEANS FOR FEEDING AN ORIGINAL SHEET TO THE DRUM FOR SEATED TRANSPORT ON THE BLANKET, A FIRST SOURCE TO HIGH CHARGING VOLTAGE WHICH IS OF FIRST POLARITY WITH RESPECT TO GROUND, A SECOND SOURCE OF HIGH CHARGING VOLTAGE WHICH IS OF SECOND AND OPOSITE POLARITY WITH RESPECT TO GROUND, MEANS FOR APPLYING THE VOLTAGES TO THE FACE OF THE ORIGINAL SHEET FOR CAUSING THE LATTER TO SEATINGLY ADHERE TO THE DRUM, SAID VOLTAGES BEING APPLIED IN SUCH SEQUENCE THAT A GIVEN AREA ON THE SURFACE OF THE BLANKET IS ALTERNATELY SUBJECTED TO CHARGES OF FIRST AND SECOND POLARITY THEREBY TO AVOID ANY TENDENCY TOWARD ACCUMULATION ON THE SURFACE OF THE BLANKET OF A CHARGE OF ONE POLARITY INCIDENT TO SUCCESSIVE CYCLES OF ROTATION OF THE DRUM.
Claim 2
Dependent Claim
174 words
IN AN ELECTROSTATIC PHOTOCOPY MACHINE OR THE LIKE REQUIRING TRANSPORT OF AN ORIGINAL SHEET ALONG A CURVED PATH OF TRANSPORT, THE COMBINATION COMPRISING A FRAME, A CYLINDRICAL DRUM GROUNDED TO AND JOURNALLED IN THE FRAME AND HAVING MEANS FOR DRIVING THE SAME, AN INSULATING BLANKET ON THE DRUM, MEANS FOR FEEDING AN ORIGINAL SHEET TO THE DRUM FOR SEATED TRANSPORT ON THE BLANKET, A FIRST SOURCE TO HIGH CHARGING VOLTAGE WHICH IS OF FIRST POLARITY WITH RESPECT TO GROUND, A SECOND SOURCE OF HIGH CHARGING VOLTAGE WHICH IS OF SECOND AND OPOSITE POLARITY WITH RESPECT TO GROUND, MEANS FOR APPLYING THE VOLTAGES TO THE FACE OF THE ORIGINAL SHEET FOR CAUSING THE LATTER TO SEATINGLY ADHERE TO THE DRUM, SAID VOLTAGES BEING APPLIED IN SUCH SEQUENCE THAT A GIVEN AREA ON THE SURFACE OF THE BLANKET IS ALTERNATELY SUBJECTED TO CHARGES OF FIRST AND SECOND POLARITY THEREBY TO AVOID ANY TENDENCY TOWARD ACCUMULATION ON THE SURFACE OF THE BLANKET OF A CHARGE OF ONE POLARITY INCIDENT TO SUCCESSIVE CYCLES OF ROTATION OF THE DRUM.
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) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |