US3234868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying apparatus
Assignee: 3M Co
•
Filing: 1963-12-26
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Granted: 1966-02-15
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Expires: 1983-12-26
Abstract
No abstract record available.
Inventors
- 👤 Roger H Appeldorn
- 👤 Lionel R Schwartz
- 👤 Lavern L Linse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/002; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/16; G03B27/18; G03B27/22; G03B27/30; G03B27/303
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
COPYING APPARATUS COMPRISING IN COMBINATION, AN EXPOSURE UNIT FORMING A COVER MEMBER, A HEATING UNIT FORMING A BASE MEMBER, AND SHEET-HOLDING MEANS HELD WITHIN SAID BASE MEMBER BY SAID COVER MEMBER, AND WHEREIN THE SAID HEATING UNIT IS FURTHER CHARACTERIZED AS COMPRISING: AN UPWARDLY BOWED ARCUATE PLATED; A PLURALITY OF ELECTRICAL HEATING UNITS SUSPENDED BENEATH SAID PLATEN FOR SUPPLYING HEAT THERETO BY BOTH RADIATION AND CONVECTION, SAID UNITS BEING SO DISTRIBUTED AS TO SUPPLY LARGE QUANTITIES OF HEAT AT GREATER DISTANCES FROM THE PEAK OF SAID PLATED; CONTROL MEANS FOR ACTUATING SAID HEATING UNITS AND FOR MAINTAINING A PREDETERMINED PLATED TEMPERATURE; AND PRESSING MEANS INCLUDING A TRANSPARENT HEATRESISTANT FLEXIBLE WEB STRETCHED BETWEEN ELONGATE END SUPPORTS BY INTERVENING LEAF SPRING SIDE MEMBERS FORMING
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |