US3553142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope and solvent compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane and acetonitrile
Assignee: Honeywell International Inc
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Filing: 1968-12-23
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Granted: 1971-01-05
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Expires: 1988-12-23
Abstract
Abstract CERTAIN MIXTURES OF 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE AND ACETONITRILE ARE USEFUL AS SOLVENTS TO REMOVE ROSIN FLUXES FROM PRINTED CIRCUIT BOARDS. THESE MIXTURES ARE USEFUL BECAUSE OF THEIR UNUSUALLY HIGH SOLVENCY CHARACTERISTICS. A NARROWER CLASS OF SUCH MIXTURES IS-PARTICULARLY VALUABLE BECAUSE, IN ADDITION TO HIGH SOLVENCY CHARACTERISTICS, THE MIXTURES EXHIBIT ESSENTIALLY THE CONSTANT BOILING CHARACTERISTICS OF A BINARY AZEOTROPE WHICH IS FORMED BETWEEN THESE COMPONENTS, THEREBY FACILIATING HANDLING AND PURIFICATION OF THE SOLVENT MIXTURES WITHOUT SIGNIFICANTLY ALTERING THEIR COMPOSITIONS.
Inventors
- 👤 Francis J Figiel
- 👤 Raymond A Nesbitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:40
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819; C10; C10M; C10M3/00; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10M2215/00; C10M2215/16; C10N; C10N2040/00; C10N2040/08
Claims Analysis
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |