US3556656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact photography frame utilizing depressurization
Assignee: Individual
•
Filing: 1968-07-02
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Granted: 1971-01-19
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Expires: 1988-07-02
Abstract
Abstract A RECTANGULAR FRAME HAVING MOUNTED THEREIN A FLEXIBLE TRANSPARENT AND A STRETCHABLE SHEET. THE VOLUME ENCLOSED BY THE FRAME AND SHEETS MAY BE DEPRESSURIZED BY A CONVENTIONAL VACUUM CLEANER OR OTHER HIGH-VOLUME LOW-PRESSURE FLUID PUMP FOR WHICH A SUITABLE FITTING IS PROVIDED IN THE SIDE OF THE FRAME. A NEGATIVE AND SENSITIZED SHEET WITHIN THE FRAME ARE PRESSED TOGETHER BY COLLAPSE OF THE STRETCHABLE SHEET FOR EXPOSURE IN A CONTACT PHOTOGRAPHY PROCESS. THE FRAME IS PREFERABLY HOLLOW WITH OPENINGS SURROUNDING THE TOP INTERIOR PORTION TO PERMIT RAPID DEPRESSURIZATION OF THE INTERIOR.
Inventors
- 👤 Gunnar Evensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:42
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/18; G03B27/20
Claims Analysis
Total Claims: 0
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |