US2689019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of chemicals from gases and apparatus
Assignee: Research Corp
•
Filing: 1949-10-27
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Granted: 1954-09-14
•
Expires: 1969-10-27
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Roberts
- 👤 Alexander N Crowder
- 👤 Rabkin Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; D21C11/063; D21C11/066; B; B03; B03C; B03C3/00; B03C3/017; B03C3/02; B03C3/04; B03C3/08; B03C3/34; B03C3/40; B03C3/41; B03C3/45; B03C3/47; B03C3/74; B03C3/76; B03C3/88; B03C2201/00; B03C2201/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
THE METHOD OF REMOVING SUSPENDED PARTICLES OF CHEMICAL COMPOUNDS FROM CHEMICAL WOOD PULP RECOVERY FURNACE GASES, WHICH COMPRISES COLLECTING SAID PARTICLES ON CHARGED ELETRODES, VIBRATING SAID ELECTRODES TO REMOVE SAID
Claim 2
Independent Claim
30 words
THE METHOD OF REMOVING SUSPENDED PARTICLES OF CHEMICAL COMPOUNDS FROM CHEMICAL WOOD PULP RECOVERY FURNACE GASES, WHICH COMPRISES COLLECTING SAID PARTICLES ON CHARGED ELETRODES, VIBRATING SAID ELECTRODES TO REMOVE SAID
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |