Patent US935616A successfully refreshed from Google Patents.
US935616A
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US
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Vitrified cement product and process of making same.
Assignee: CHICAGO FIREPROOF COVERING Co
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Filing: 1907-05-21
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Granted: 1909-09-28
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Expires: 1927-05-21
Abstract
No abstract record available.
Inventors
- 👤 Henry C Todd
- 👤 Charles Mayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:37
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; Y; Y10; Y10S; Y10S264/00; Y10S264/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1912-09-27 | 1913-03-29 | 1913-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-09-27 | 1917-03-29 | 1917-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-09-27 | 1921-03-29 | 1921-09-28 | $7700.00 | Window Closed / Lapsed |