Patent US3120790A successfully refreshed from Google Patents.
US3120790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic exposure apparatus
Assignee: SOUTHERN ATHLETIC MANUFACTURING Co
•
Filing: 1961-08-30
•
Granted: 1964-02-11
•
Expires: 1981-08-30
Abstract
No abstract record available.
Inventors
- 👤 Chester F Carlson
- 👤 Robert W Gundlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN EXPOSURE MECHANISM FOR USE IN A XEROGRAPHIC REPRODUCING APPARATUS INCLUDING A ZEROGRAPHIC PLATE MOUNTED FOR ROTATION, A CHARGING DEVICE TO PLACE A UNIFORM ELECTROSTATIC CHARGE ON THE DRUM, AND AN OPTICAL PROJECTOR TO FOCUS A RADIATION IMAGE OF AN ORIGINAL ONTO A CHARGED AREA OF THE ZEROGRAPHIC PLATE TO FORM AN ELECTROSTATIC LATENT IMAGE ON THE XEROGRAPHIC PLATE; SAID EXPOSURE MECHANISM INCLUDING A SEMITRANSPARENT PLATE, CONTAINING SUBSTANTIALLY PARALLEL OPAQUE LINES THEREON AND SUBSTANTIALLY PARALLEL TRANSPARENT LINES THEREBETWEEN, SAID OPAQUE LINES AND THE SPACING BETWEEN SAID OPAQUE LINES BEING OF EQUAL WIDTH, AND A HOLDER FOR SAID PLATE POSITIONED ADJACENT SAID XEROGRAPHIC PLATE TO MAINTAIN SAID PLATE SUBSTANITALLY PARALLEL TO THE AXIS OF ROTATION OF SAID XEROGRAPHIC PLATE WITH SAID OPAQUE LINES POSITIONED SUBSTAN-
Claim 2
Dependent Claim
124 words
AN EXPOSURE MECHANISM FOR USE IN A XEROGRAPHIC REPRODUCING APPARATUS INCLUDING A ZEROGRAPHIC PLATE MOUNTED FOR ROTATION, A CHARGING DEVICE TO PLACE A UNIFORM ELECTROSTATIC CHARGE ON THE DRUM, AND AN OPTICAL PROJECTOR TO FOCUS A RADIATION IMAGE OF AN ORIGINAL ONTO A CHARGED AREA OF THE ZEROGRAPHIC PLATE TO FORM AN ELECTROSTATIC LATENT IMAGE ON THE XEROGRAPHIC PLATE; SAID EXPOSURE MECHANISM INCLUDING A SEMITRANSPARENT PLATE, CONTAINING SUBSTANTIALLY PARALLEL OPAQUE LINES THEREON AND SUBSTANTIALLY PARALLEL TRANSPARENT LINES THEREBETWEEN, SAID OPAQUE LINES AND THE SPACING BETWEEN SAID OPAQUE LINES BEING OF EQUAL WIDTH, AND A HOLDER FOR SAID PLATE POSITIONED ADJACENT SAID XEROGRAPHIC PLATE TO MAINTAIN SAID PLATE SUBSTANITALLY PARALLEL TO THE AXIS OF ROTATION OF SAID XEROGRAPHIC PLATE WITH SAID OPAQUE LINES POSITIONED SUBSTAN-
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) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |