Patent US3562226A successfully refreshed from Google Patents.
US3562226A
Expired / Lapsed
US
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Friction reducing
Assignee: Calgon Corp
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Filing: 1969-08-13
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Granted: 1971-02-09
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Expires: 1989-08-13
Abstract
Abstract REDUCTION OF FRICITION LOSS IN OIL WELL FRACTURING IS ACCOMPLISHED THROUGH THE ADDITION OF SMALL AMOUNTS OF COPOLYMERS OF ACRYLAMIDE AND DIMETHYL DIALLYL AMMONIUM CHLORIDE OR OTHER DIALLY AMMONIUM COMPOUNDS, WITH AND WITHOUT CROSSLINKING BY N,N'' METTHYLENE BISACRYLAMIDE.
Inventors
- 👤 Owen C Gayley
- 👤 M Frederick Hoover
- 👤 Leonard J Persinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C08F8/00; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |