US2620286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing carbonaceous deposits from still tubes
Assignee: Individual
•
Filing: 1948-09-03
•
Granted: 1952-12-02
•
Expires: 1968-09-03
Abstract
No abstract record available.
Inventors
- 👤 Morris R Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:34
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF REMOVING CARBONACEOUS DEPOSITS FROM STILL TUBES IN SITU COMPRISING THE STEPS OF, PRODUCING A UNIFORM FLAMELESS HEAT BY INDUCTION HEATING IN THE WALLS OF A TUBE SIMULTANEOUSLY THROUGHOUT ITS WHOLE LENGTH AND OF A SUFFICIENTLY HIGH TEMPERATURE TO DESTROY THE DEPOSITS IN THE TUBE BUT NOT SUFFICIENTLY HIGH TO ADVERSELY AFFECT THE TUBE.
Claim 2
Independent Claim
56 words
A METHOD OF REMOVING CARBONACEOUS DEPOSITS FROM STILL TUBES IN SITU COMPRISING THE STEPS OF, PRODUCING A UNIFORM FLAMELESS HEAT BY INDUCTION HEATING IN THE WALLS OF A TUBE SIMULTANEOUSLY THROUGHOUT ITS WHOLE LENGTH AND OF A SUFFICIENTLY HIGH TEMPERATURE TO DESTROY THE DEPOSITS IN THE TUBE BUT NOT SUFFICIENTLY HIGH TO ADVERSELY AFFECT THE TUBE.
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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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |