Patent US4713563A successfully refreshed from Google Patents.
Patent US3247383A successfully refreshed from Google Patents.
US3247383A
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Infra-red reflector assembly for thermographic copying machine
Assignee: 3M Co
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Filing: 1962-04-13
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Granted: 1966-04-19
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Expires: 1982-04-13
Abstract
No abstract record available.
Inventors
- 👤 John W Ulseth
- 👤 Robert A Halberg
- 👤 John A Gravelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:23
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/30; G03B27/306; F; F21; F21V; F21V7/00; F21V7/22; F21V7/28; G03B27/16; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
A REFLECTOR CHARACTERIZED BY HIGH REFLECTIVITY AND HIGH TEMPERATURE STABILITY AND COMPRISING: A PAIR OF COMPLEMENTAL ALUMINUM SHELLS DEFINING AN ELONGATE INTERIOR CAVITY, FOR CONFINING AN ELONGATE TUBULAR LAMP IN FIXED POSITION AT THE FOCUS THEREOF, AND A NARROW LENGTHWISE OPENING FOR CONCENTRATING RADIANT ENERGY FROM A SAID LAMP ALONG A NARROW BAND; A THIN LAYER OF LOW TEMPERATURE PORCELAIN ENAMEL HAVING A SMOOTH HIGH GLOSS FINISH BONDED TO THE CAVITY-DEFINING SURFACES OF SAID SHELLS; AND A THIN METALLIC GOLD FILM, HAVING AT LEAST 93 PERCENT REFLECTANCE FOR INFRA-RED RADIATION, BONDED TO SAID ENAMEL LAYER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |