US3770640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerants colored for leak indication
Assignee: EIDP Inc
•
Filing: 1971-11-22
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Granted: 1973-11-06
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Expires: 1991-11-22
Abstract
Abstract REFRIGERANTS, REFRIGERATION OILS AND REFRIGERATION-REFRIGERATION OIL MIXTURES CONTAINING ANTHRAQUINONE DYES HAVING THE STRUCTURE 1-R1,4-R2,5-R4,8-R3-ANTHRAQUINONE WHEREIN R1, R2, R3 AND R4 ARE EACH H OR AN ANILINO GROUP, SUBSTITUTED BY FROM 1 TO 3 SATURATED ALKYL GROUPS HAVING A TOTAL OF FROM 4 TO 24 CARBON ATOMS, AND WHEREIN AT LEAST 2 AND NO MORE THAN 3 OF R1, R2, R3 AND R4 ARE H.
Inventors
- 👤 P Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:46
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C09K5/20; C10; C10M; C10M171/00; C10M171/008; C09K2205/00; C09K2205/10; C09K2205/12; C09K2205/122; C09K2205/32; Y; Y10; Y10S; Y10S252/00; Y10S252/964
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |