US2972552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All carbon impervious graphite and carbon articles
Assignee: Union Carbide Corp
•
Filing: 1957-03-08
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Granted: 1961-02-21
•
Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Lester L Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:41
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/521; C08L23/04; C08L23/06; C08L23/08; C08L23/0807; C08L23/0815; C08L23/18; C08L2203/00; C08L2203/12; C08L23/0846; C08L23/0892; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A CARBON ARTICLE, THE INTERSTITIAL OPENINGS OF WHICH ARE SUBSTANTIALLY BLOCKED BY CARBONACEOUS DEPOSITS IN THE FORM OF ISOLATED MICROBUBBLES, SAID CARBONACEOUS DEPOSITS COMPRISING THE DECOMPOSITION PRODUCT OF FURANKETONE CONDENSATION PRODUCT, SAID ARTICLE BEING SUBSTANTIALLY IMPERVIOUS THROUGHOUT ITS CROSS SECTION.
Claim 2
Dependent Claim
40 words
A CARBON ARTICLE, THE INTERSTITIAL OPENINGS OF WHICH ARE SUBSTANTIALLY BLOCKED BY CARBONACEOUS DEPOSITS IN THE FORM OF ISOLATED MICROBUBBLES, SAID CARBONACEOUS DEPOSITS COMPRISING THE DECOMPOSITION PRODUCT OF FURANKETONE CONDENSATION PRODUCT, SAID ARTICLE BEING SUBSTANTIALLY IMPERVIOUS THROUGHOUT ITS CROSS SECTION.
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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) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |