US2890409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic testing of sheet materials
Assignee: General Mills Inc
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Filing: 1954-01-11
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Granted: 1959-06-09
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Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 Edward R Van Krevelen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A MECHANISM FOR DETECTING AND REPAIRING IMPERFECTIONS IN THERMOPLASTIC SHEET MATERIAL HAVING DIELECTRIC STRENGTH GREATER THAN AIR COMPRISING A FIRST AND SECOND ELECTRODE SPACED FROM EACH OTHER TO FORM A GAP FOR PASSING A SHEET OF MATERIAL THEREBETWEEN, A CONDENSER CONNECTED BETWEEN SAID ELECTRODE, MEANS CONNECTED TO CHARGE THE CONDENSER TO A STRENGTH SUFFICIENT TO DISCHARGE ACROSS SAID GAP WHEN THE DIELECTRIC STRENGTH OF THE MATERIAL PASSED THROUGH THE GAP DROPPED BELOW A PREDETERMINED LEVEL, SAID DISCHARGE PRODUCING SUFFICIENT HEAT TO INCREASE THE DIELECTRIC STRENGTH WHERE IT WAS
Claim 2
Dependent Claim
88 words
A MECHANISM FOR DETECTING AND REPAIRING IMPERFECTIONS IN THERMOPLASTIC SHEET MATERIAL HAVING DIELECTRIC STRENGTH GREATER THAN AIR COMPRISING A FIRST AND SECOND ELECTRODE SPACED FROM EACH OTHER TO FORM A GAP FOR PASSING A SHEET OF MATERIAL THEREBETWEEN, A CONDENSER CONNECTED BETWEEN SAID ELECTRODE, MEANS CONNECTED TO CHARGE THE CONDENSER TO A STRENGTH SUFFICIENT TO DISCHARGE ACROSS SAID GAP WHEN THE DIELECTRIC STRENGTH OF THE MATERIAL PASSED THROUGH THE GAP DROPPED BELOW A PREDETERMINED LEVEL, SAID DISCHARGE PRODUCING SUFFICIENT HEAT TO INCREASE THE DIELECTRIC STRENGTH WHERE IT WAS
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) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |