Patent US3267847A successfully refreshed from Google Patents.
US3267847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing stencils for use in stencil duplicating
Assignee: Riso Kagaku Corp
•
Filing: 1964-08-03
•
Granted: 1966-08-23
•
Expires: 1984-08-03
Abstract
No abstract record available.
Inventors
- 👤 Hayama Noborn
- 👤 Ishijima Kazuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:42
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD OF PREPARING A STENCIL SHEET FOR USE IN REPRODUCING BLACK MASTER MATERIAL COMPRISING THE STEPS OF HEAT STRETCHING A STENCIL SHEET HAVING THEREON A HEAT SHRINKABLE FILM OF A COPOLYMER OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE TO THE EXTENT THAT SAID SHEET WILL SHRINK BETWEEN ABOUT TWO TO THREE MILLIMETERS FOR A SHEET OF ABOUT TWENTY CENTIMETERS SQUARE, SUPERPOSING SAID SHEET UPON THE MATERIAL TO BE REPRODUCED, IRRADIATING SAID STRETCHED SHEET WITH INFRARED RAYS FROM A LAMP MOVING AT BETWEEN ABOUT THREE TO SIX CENTIMETERS PER SECOND ACROSS THE SHEET SO AS TO PERFORATE THE SHEET, THE SHAPE OF THE PERFORATIONS CORRESPONDNG TO THE MASTER MATERIAL TO BE REPRODUCED.
Claim 2
Independent Claim
111 words
A METHOD OF PREPARING A STENCIL SHEET FOR USE IN REPRODUCING BLACK MASTER MATERIAL COMPRISING THE STEPS OF HEAT STRETCHING A STENCIL SHEET HAVING THEREON A HEAT SHRINKABLE FILM OF A COPOLYMER OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE TO THE EXTENT THAT SAID SHEET WILL SHRINK BETWEEN ABOUT TWO TO THREE MILLIMETERS FOR A SHEET OF ABOUT TWENTY CENTIMETERS SQUARE, SUPERPOSING SAID SHEET UPON THE MATERIAL TO BE REPRODUCED, IRRADIATING SAID STRETCHED SHEET WITH INFRARED RAYS FROM A LAMP MOVING AT BETWEEN ABOUT THREE TO SIX CENTIMETERS PER SECOND ACROSS THE SHEET SO AS TO PERFORATE THE SHEET, THE SHAPE OF THE PERFORATIONS CORRESPONDNG TO THE MASTER MATERIAL TO BE REPRODUCED.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |