US1636830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement composition and method of preparation
Assignee: AT&T Inc
•
Filing: 1924-09-30
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Granted: 1927-07-26
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Expires: 1944-09-30
Abstract
No abstract record available.
Inventors
- 👤 Alexander M Nicolson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
H; H04; H04R; H04R17/00; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/42
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) | 1930-07-25 | 1931-01-24 | 1931-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-07-25 | 1935-01-24 | 1935-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-07-25 | 1939-01-24 | 1939-07-26 | $7700.00 | Window Closed / Lapsed |