Patent US3174419A successfully refreshed from Google Patents.
US3174419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-producing apparatus
Assignee: Polaroid Corp
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Filing: 1962-07-03
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Granted: 1965-03-23
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Expires: 1982-07-03
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Sable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:42
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03D; G03D9/00; G03D9/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
APPARATUS FOR PRODUCING LIGHT PULSES OF SUBSTANTIALLY UNIFORM INTENSITY AT A PREDETERMINED FREQUENCY COMPRISING, IN COMBINATION: AN ELECTROLUMINESCENT ELEMENT FOR EMITTING SAID LIGHT PULSES WHEN EXCITED BY A VOLTAGE HAVING A PREDETERMINED CHARACTER; A PIEZOELECTRIC CRYSTAL RESPONSIVE TO A CHANGE IN STRESS APPLIED TO SAID CRYSTAL FOR PRODUCING A VOLTAGE PROPORTIONAL TO THE RATE OF CHANGE OF SAID STRESS; MEANS FOR INTERMITTENTLY APPLYING VOLTAGE-PRODUCING STRESSES HAVING A SUBSTANTIALLY UNIFORM RATE OF CHANGE TO SAID CRYSTAL AT SAID PREDETERMINED FREQUENCY TO CAUSE SAID CRYSTAL TO GENERATE A VOLTAGE AS SAID STRESSES CHANGE; AND ELECTRICALLY CONDUTIVE MEANS COUPLING WITH SAID CRYSTAL AND SAID ELEMENT FOR APPLYING THE VOLTAGE DEVELOPED BY SAID CRYSTAL TO SAID ELEMENT TO EXCITE THE LATTER TO LIGHT EMISSION.
Claim 2
Dependent Claim
120 words
APPARATUS FOR PRODUCING LIGHT PULSES OF SUBSTANTIALLY UNIFORM INTENSITY AT A PREDETERMINED FREQUENCY COMPRISING, IN COMBINATION: AN ELECTROLUMINESCENT ELEMENT FOR EMITTING SAID LIGHT PULSES WHEN EXCITED BY A VOLTAGE HAVING A PREDETERMINED CHARACTER; A PIEZOELECTRIC CRYSTAL RESPONSIVE TO A CHANGE IN STRESS APPLIED TO SAID CRYSTAL FOR PRODUCING A VOLTAGE PROPORTIONAL TO THE RATE OF CHANGE OF SAID STRESS; MEANS FOR INTERMITTENTLY APPLYING VOLTAGE-PRODUCING STRESSES HAVING A SUBSTANTIALLY UNIFORM RATE OF CHANGE TO SAID CRYSTAL AT SAID PREDETERMINED FREQUENCY TO CAUSE SAID CRYSTAL TO GENERATE A VOLTAGE AS SAID STRESSES CHANGE; AND ELECTRICALLY CONDUTIVE MEANS COUPLING WITH SAID CRYSTAL AND SAID ELEMENT FOR APPLYING THE VOLTAGE DEVELOPED BY SAID CRYSTAL TO SAID ELEMENT TO EXCITE THE LATTER TO LIGHT EMISSION.
Claim 3
Dependent Claim
117 words
IN PHOTOGRAPHIC APPARATUS FOR EXPOSING PHOTOSENSITIVE MATERIAL DURING MOVEMENT OF SAID MATERIAL THEROUGH SAID APPARATUS, IN COMBINATION: AN ELECTROLUMINESCENT SOURCE OF LIGHT ACTINIC TO SAID PHOTOSENSITIVE MATERIAL; MEANS FOR GUIDING SAID PHOTOSENSITIVE MATERIAL PAST SAID SOURCE IN POSITION FOR EXPOSURE TO LIGH FROM SAID SOURCE; A PIEZOELECTRIC CRYSTAL FOR PRODUCING A VOLTAGE IN RESPONSE TO THE APPLICATION OF A CHANGING STRESS TO SAID CYSTAL; MEANS RESPONSIVE TO THE MOVEMENT OF SAID PHOTOSENSITIVE MATERIAL FOR APPLYING SUCCESSIVE STRESSES TO SAID CRYSTAL TO CAUSE SAID CRYSTAL TO PRODUCE VOLTAGE, SAID MEANS ALTERNATELY COMPRESSING SAID CRYSTAL AND RE LIEVING THE PRESSURE ON SAID CRYSTAL AT A FFREQUENCY WHICH IS PREDETERMINEDLY RELATED TO THE RATE OF MOVEMENT OF SAID PHOTOSENSITIVE MATERIAL.
Claim 4
Dependent Claim
117 words
IN PHOTOGRAPHIC APPARATUS FOR EXPOSING PHOTOSENSITIVE MATERIAL DURING MOVEMENT OF SAID MATERIAL THEROUGH SAID APPARATUS, IN COMBINATION: AN ELECTROLUMINESCENT SOURCE OF LIGHT ACTINIC TO SAID PHOTOSENSITIVE MATERIAL; MEANS FOR GUIDING SAID PHOTOSENSITIVE MATERIAL PAST SAID SOURCE IN POSITION FOR EXPOSURE TO LIGH FROM SAID SOURCE; A PIEZOELECTRIC CRYSTAL FOR PRODUCING A VOLTAGE IN RESPONSE TO THE APPLICATION OF A CHANGING STRESS TO SAID CYSTAL; MEANS RESPONSIVE TO THE MOVEMENT OF SAID PHOTOSENSITIVE MATERIAL FOR APPLYING SUCCESSIVE STRESSES TO SAID CRYSTAL TO CAUSE SAID CRYSTAL TO PRODUCE VOLTAGE, SAID MEANS ALTERNATELY COMPRESSING SAID CRYSTAL AND RE LIEVING THE PRESSURE ON SAID CRYSTAL AT A FFREQUENCY WHICH IS PREDETERMINEDLY RELATED TO THE RATE OF MOVEMENT OF SAID PHOTOSENSITIVE MATERIAL.
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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |