US3249225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic separation means
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1962-02-09
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Granted: 1966-05-03
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Expires: 1982-02-09
Abstract
No abstract record available.
Inventors
- 👤 Otmar M Stuetzer
- 👤 Allen M Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
B; B03; B03C; B03C7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
SELECTIVE SEPARATION MEANS FOR SEPARATING PARTICULATE MATERIALS HAVING DIFFERENT ELECTRICAL CHARACTERISTICS COMPRISING MEANS FOR DEPOSITING SAID MATERIALS ON A SURFACE FROM WHICH SAID MATERIALS TEND TO BE REMOVED BY A NATURAL FORCE, IONIZING MEANS LOCATED ADJACENT SAID SURFACE AND SAID MATERIALS FOR PROVIDING ELECTRIC CHARGES ON SAID MATERIALS AND THEREBY ESTABLISHING AN ELECTRIC FIELD BETWEEN SAID MATERIALS AND SAID SURFACE, MEANS FOR REPETITIVELY ENERGIZING AND DEENERGIZING SAID IONIZING MEANS SO THAT SAID IONIZING MEANS IS PERIODICALLY ENERGIZED FOR A TIME INTERVAL WHICH IS LESS THAN A FIRST TIME CONSTANT OF MATERIALS TO BE REMOVED BY SAID NATURAL FORCE FROM SAID SURFACE AND LONGER THAN A SECOND TIME CONSTANT OF MATERIALS TO BE RETAINED ON SAID SURFACE AND MEANS FOR REMOVING SAID MATERIALS RETAINED ON SAID SURFACE PRIOR TO THE TERMINATION OF A PERIOD OF TIME SHORTER THAN SAID SECOND TIME CONSTANT.
Claim 2
Dependent Claim
141 words
SELECTIVE SEPARATION MEANS FOR SEPARATING PARTICULATE MATERIALS HAVING DIFFERENT ELECTRICAL CHARACTERISTICS COMPRISING MEANS FOR DEPOSITING SAID MATERIALS ON A SURFACE FROM WHICH SAID MATERIALS TEND TO BE REMOVED BY A NATURAL FORCE, IONIZING MEANS LOCATED ADJACENT SAID SURFACE AND SAID MATERIALS FOR PROVIDING ELECTRIC CHARGES ON SAID MATERIALS AND THEREBY ESTABLISHING AN ELECTRIC FIELD BETWEEN SAID MATERIALS AND SAID SURFACE, MEANS FOR REPETITIVELY ENERGIZING AND DEENERGIZING SAID IONIZING MEANS SO THAT SAID IONIZING MEANS IS PERIODICALLY ENERGIZED FOR A TIME INTERVAL WHICH IS LESS THAN A FIRST TIME CONSTANT OF MATERIALS TO BE REMOVED BY SAID NATURAL FORCE FROM SAID SURFACE AND LONGER THAN A SECOND TIME CONSTANT OF MATERIALS TO BE RETAINED ON SAID SURFACE AND MEANS FOR REMOVING SAID MATERIALS RETAINED ON SAID SURFACE PRIOR TO THE TERMINATION OF A PERIOD OF TIME SHORTER THAN SAID SECOND TIME CONSTANT.
References Cited (Backward Citations)
US2314939A
Cited
US3012668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |