US3554643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure system
Assignee: Polaroid Corp
•
Filing: 1968-08-28
•
Granted: 1971-01-12
•
Expires: 1988-08-28
Abstract
Abstract A DOCUMENT COPIER EXPOSURE SYSTEM INCLUDING A PAIR OF LIGHT SOURCES HAVING BAFFLES LOCATED WITHIN A CHAMBER, THE CHAMBER INCLUDING A PAIR OF REFLECTING SURFACES AND A WINDOW FOR SUPPORTING AN ORGINAL IN POSITION FOR EXPOSURE SUCH THAT THE INTENSITY OF THE LIGHT INCIDENT UPON THE ORIGINAL DECREASES INWARDLY TOWARD THE CENTER THEREOF. THE LIGHT SOURCES AND THE REFLECTIG SURFACES ARE POSITIONED SUCH THAT THE LATTER FORM MULTIPLE VIRTUAL IMAGES OF EACH OF THE LIGHT SOURCES APPEARING TO THE WINDOW TO BE LOCATED OUTSIDE OF THE CHAMBER.
Inventors
- 👤 John F Batter Jr
- 👤 Joseph A Stella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:51
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/542
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |