US2685541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory carbon and method of producing the same
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1952-03-14
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Granted: 1954-08-03
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Expires: 1972-03-14
Abstract
No abstract record available.
Inventors
- 👤 Jr James Woodburn
- 👤 Rawley F Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:02
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/52; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092; C04B41/80; C04B41/81; C04B41/85; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A CARBON BODY OF IMPROVED RESISTANCE TO OXIDATION CONTAINING IN THE PORES THEREOF A COMPOSITION COMPRISING ESSENTIALLY CALCIUM PHOSPHATE COMPOUND, THE MOLAR RATIO OF CAO:P2O5 IN SAID COMPOUND BEING BETWEEN ABOUT 1.1:1 AND ABOUT 1.8:1.
Claim 2
Dependent Claim
35 words
A CARBON BODY OF IMPROVED RESISTANCE TO OXIDATION CONTAINING IN THE PORES THEREOF A COMPOSITION COMPRISING ESSENTIALLY CALCIUM PHOSPHATE COMPOUND, THE MOLAR RATIO OF CAO:P2O5 IN SAID COMPOUND BEING BETWEEN ABOUT 1.1:1 AND ABOUT 1.8:1.
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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |