US2676180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning phthalic anhydride condensers and like apparatus
Assignee: Beazer East Inc
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Filing: 1952-10-21
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Granted: 1954-04-20
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Expires: 1972-10-21
Abstract
No abstract record available.
Inventors
- 👤 Howard E Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:14
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/573
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
THE METHOD OF REMOVING PHTHALIC ACIDCONTAINING DEPOSITS FROM APPARATUS USED IN THE HANDLING OF CRUDE PHTHALIC ANHYDRIDE WHICH COMPRISES FLUSHING SAID APPARATUS WITH A SODIUM BICARBONATE SOLUTION.
Claim 2
Independent Claim
27 words
THE METHOD OF REMOVING PHTHALIC ACIDCONTAINING DEPOSITS FROM APPARATUS USED IN THE HANDLING OF CRUDE PHTHALIC ANHYDRIDE WHICH COMPRISES FLUSHING SAID APPARATUS WITH A SODIUM BICARBONATE SOLUTION.
Claim 3
Dependent Claim
65 words
IN A PROCESS FOR THE MANUFACTURE OF PHTHALIC ANHYDRIDE BY AIR OXIDATION OF NAPHTHALENE IN WHICH THE PHTHALIC ANHYDRIDE IS CONDENSED ON THE COOLING SURFACES OF A CONDENSER AND SUBSEQUENTLY MELTED OFF SAID SURFACES, THE METHOD OF CLEANING SAID SURFACES OF RESIDUE WHICH IS DEPOSITED THEREON AFTER REPEATED CYCLES OF SAID CONDENSING AND MELTING OPERATIONS WHICH COMPRISES FLUSHING SAID SURFACES WITH A SODIUM BICARBONATE SOLUTION.
Claim 4
Dependent Claim
65 words
IN A PROCESS FOR THE MANUFACTURE OF PHTHALIC ANHYDRIDE BY AIR OXIDATION OF NAPHTHALENE IN WHICH THE PHTHALIC ANHYDRIDE IS CONDENSED ON THE COOLING SURFACES OF A CONDENSER AND SUBSEQUENTLY MELTED OFF SAID SURFACES, THE METHOD OF CLEANING SAID SURFACES OF RESIDUE WHICH IS DEPOSITED THEREON AFTER REPEATED CYCLES OF SAID CONDENSING AND MELTING OPERATIONS WHICH COMPRISES FLUSHING SAID SURFACES WITH A SODIUM BICARBONATE SOLUTION.
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) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |