Patent US2878666A successfully refreshed from Google Patents.
US2878666A
Expired / Lapsed
US
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Lightweight ceramic tiles
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1953-10-14
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Granted: 1959-03-24
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Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 Folsom E Drummond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:31
CPC Classifications
C; C04; C04B; C04B38/00; E; E04; E04F; E04F13/00; E04F13/07; E04F13/08; E04F13/14; E04F13/142; C04B2111/00; C04B2111/00474; C04B2111/00612; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1778727A
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US2156149A
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US2204743A
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US2240027A
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US2352201A
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US2430987A
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GB654367A
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US2637995A
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US2664406A
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US2760881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |