US3490938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive flock
Assignee: Calgon Corp
•
Filing: 1966-12-20
•
Granted: 1970-01-20
•
Expires: 1986-12-20
Abstract
No abstract record available.
Inventors
- 👤 Merwin Frederick Hoover
- 👤 Robert O Carothers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:31
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/122; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23943; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2897201A
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US2848451A
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US2992126A
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US3203821A
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US3264137A
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US3322554A
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US3288770A
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US3335100A
Cited
US3248279A
Cited
US3356521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |