Patent US3804423A successfully refreshed from Google Patents.
US2851373A
Expired / Lapsed
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⏱️ 0.0 years remaining
Developing electrostatic latent images on photo-conductive insulating material
Assignee: Bruning Charles Co Inc
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Filing: 1955-11-21
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Granted: 1958-09-09
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Expires: 1975-11-21
Abstract
No abstract record available.
Inventors
- 👤 John L Tregay
- 👤 John J Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:00
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS OF DEVELOPING ELECTROSTATIC LATENT IMAGES ON PHOTO-CONDUCTIVE INSULATING MATERIAL, WHICH PROCESS COMPRISES SUPPORTING A BODY OF CARRIER PARTICLES ADMIXED WITH DEVELOPER POWDER ON A PAIR OF ABUTTING ROTATABLE FEED ROOLS, ROTATING SAID FEED ROOLS TO AGITATE THE BASE OF SAID BODY AND THUS MAINTAIN SAID MIXTURE IN SAID BODY IN A LOOSE UNCOMPACTED CONDITION AND TO SIMULTANEOUSLY FEED SAID PHOTO-CONDUCTIVE INSULATING MATERIAL THROUGH THE NIP OF THE FEED ROLLS AND THE AGITATED BODY OF DEVELOPER POWDER SO THAT THE PHOTO-CONDUCTIVE INSULATING MATERIAL CONTAINING SAID IMAGES IS CONTACTED BY THE LOOSE MIXTURE THEREBY DEPOSITING AND ADHERING THE DEVELOPER POWDER IN SAID MIXTURE TO THE LATENT IMAGES ON SAID PHOTO-CONDUCTIVE INSULATING MATERIAL, REMOVING THE PHOTO-CONDUCTIVE INSULATING MATERIAL HAVING THE DEVELOPER POWDER THUS DEPOSITED THEREON FROM SAID AGITATED BODY OF DEVELOPER POWDER AND FIXING THE DEVELOPER POWDER ON SAID PHOTOCONDUCTIVE INSULATING MATERIAL.
Claim 2
Dependent Claim
141 words
A PROCESS OF DEVELOPING ELECTROSTATIC LATENT IMAGES ON PHOTO-CONDUCTIVE INSULATING MATERIAL, WHICH PROCESS COMPRISES SUPPORTING A BODY OF CARRIER PARTICLES ADMIXED WITH DEVELOPER POWDER ON A PAIR OF ABUTTING ROTATABLE FEED ROOLS, ROTATING SAID FEED ROOLS TO AGITATE THE BASE OF SAID BODY AND THUS MAINTAIN SAID MIXTURE IN SAID BODY IN A LOOSE UNCOMPACTED CONDITION AND TO SIMULTANEOUSLY FEED SAID PHOTO-CONDUCTIVE INSULATING MATERIAL THROUGH THE NIP OF THE FEED ROLLS AND THE AGITATED BODY OF DEVELOPER POWDER SO THAT THE PHOTO-CONDUCTIVE INSULATING MATERIAL CONTAINING SAID IMAGES IS CONTACTED BY THE LOOSE MIXTURE THEREBY DEPOSITING AND ADHERING THE DEVELOPER POWDER IN SAID MIXTURE TO THE LATENT IMAGES ON SAID PHOTO-CONDUCTIVE INSULATING MATERIAL, REMOVING THE PHOTO-CONDUCTIVE INSULATING MATERIAL HAVING THE DEVELOPER POWDER THUS DEPOSITED THEREON FROM SAID AGITATED BODY OF DEVELOPER POWDER AND FIXING THE DEVELOPER POWDER ON SAID PHOTOCONDUCTIVE INSULATING 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) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |