US3353334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of entrained solids from gases
Assignee: Princeton Chemical Research Inc
•
Filing: 1965-06-09
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Granted: 1967-11-21
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Expires: 1985-06-09
Abstract
No abstract record available.
Inventors
- 👤 Richard I Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:31
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/573; Y; Y10; Y10S; Y10S159/00; Y10S159/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD FOR RECOVERING PYROMELLITIC DIANHYDRIDE FROM THE REACTION GAS OF A VAPOR PHASE CATALYTIC REACTION FOR ITS PRODUCTION WHICH COMPRISES FLOWING THE REACTION GAS IN CONTACT WITH A SCRUBBING LIQUID IN AEROSOL FORM THROUGH A CONSTRICTION WITH A CONTACTING POWER SUFFICIENT TO CAUSE A FRICTION LOSS OF AT LEAST 960 (FOOT POUND FORCE)/ POUND MASS, AND THEREAFTER SEPARATING THE SCRUBBING LIQUID FROM THE GAS STREAM.
Claim 2
Independent Claim
66 words
A METHOD FOR RECOVERING PYROMELLITIC DIANHYDRIDE FROM THE REACTION GAS OF A VAPOR PHASE CATALYTIC REACTION FOR ITS PRODUCTION WHICH COMPRISES FLOWING THE REACTION GAS IN CONTACT WITH A SCRUBBING LIQUID IN AEROSOL FORM THROUGH A CONSTRICTION WITH A CONTACTING POWER SUFFICIENT TO CAUSE A FRICTION LOSS OF AT LEAST 960 (FOOT POUND FORCE)/ POUND MASS, AND THEREAFTER SEPARATING THE SCRUBBING LIQUID FROM THE GAS STREAM.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |