Patent US3301157A successfully refreshed from Google Patents.
US3301157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal developing apparatus
Assignee: GAF Chemicals Corp
•
Filing: 1964-06-08
•
Granted: 1967-01-31
•
Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Richard E Smith
- 👤 Robert L Boston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN A DIAZO TYPE APPARATUS FOR MAKING DUPLICATE COPIES OF ORIGINALS BY MEANS OF COPY PAPER REACTIVE TO ULTRA-VIOLET RADIATION TO FORM A LATENT THERMAL IMAGE WHICH IS DEVELOPED BY HEAT TO FORM A VISIBLE IMAGE, COMPRISING, A FIRST RADIATION SOURCE HAVING A SPECTRAL QUALITY PREDOMINANTLY IN THE ULTRA-VIOLET RANGE WHICH IRRADIATES A FIRST SURFACE, A SECOND RADIATION SOURCE HAVING A SPECTRAL QUALITY IN THE INFRA-RED RANGE WHICH IRRADIATES A SECOND SURFACE, MEANS FOR PASSING SAID COPY PAPER IN CONTACT WITH AN ORIGINAL OVER SAID FIRST SURFACE THEREBY SUBJECTING IT TO RADIATION OF SAID FIRST SPECTRAL RANGE AND THERAFTER PASSING SAID PAPER OVER SAID SECOND SURFACE THEREBY SUBJECTING IT TO HEAT OF SAID SECOND RADIATION SOURCE, THAT IMPROVEMENT IN SAID SECOND SURFACE COMPRISING A CYLINDER OF A MATERIAL WHICH IS HIGHLY ABSORPTIVE OF THE RADIATION OF SAID SECOND RADIATION SOURCE, AND WHEREIN SAID SECOND RADIATION
Claim 2
Dependent Claim
145 words
IN A DIAZO TYPE APPARATUS FOR MAKING DUPLICATE COPIES OF ORIGINALS BY MEANS OF COPY PAPER REACTIVE TO ULTRA-VIOLET RADIATION TO FORM A LATENT THERMAL IMAGE WHICH IS DEVELOPED BY HEAT TO FORM A VISIBLE IMAGE, COMPRISING, A FIRST RADIATION SOURCE HAVING A SPECTRAL QUALITY PREDOMINANTLY IN THE ULTRA-VIOLET RANGE WHICH IRRADIATES A FIRST SURFACE, A SECOND RADIATION SOURCE HAVING A SPECTRAL QUALITY IN THE INFRA-RED RANGE WHICH IRRADIATES A SECOND SURFACE, MEANS FOR PASSING SAID COPY PAPER IN CONTACT WITH AN ORIGINAL OVER SAID FIRST SURFACE THEREBY SUBJECTING IT TO RADIATION OF SAID FIRST SPECTRAL RANGE AND THERAFTER PASSING SAID PAPER OVER SAID SECOND SURFACE THEREBY SUBJECTING IT TO HEAT OF SAID SECOND RADIATION SOURCE, THAT IMPROVEMENT IN SAID SECOND SURFACE COMPRISING A CYLINDER OF A MATERIAL WHICH IS HIGHLY ABSORPTIVE OF THE RADIATION OF SAID SECOND RADIATION SOURCE, AND WHEREIN SAID SECOND RADIATION
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |