US2721069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight aggregate, and apparatus and process
Assignee: SOUTHERN LIGHTWEIGHT AGGRAGATE
•
Filing: 1954-07-20
•
Granted: 1955-10-18
•
Expires: 1974-07-20
Abstract
No abstract record available.
Inventors
- 👤 Old Albert Floyd
- 👤 Gibson Richard Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:12
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/061; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2209170A
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US2269700A
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US2293992A
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US2430601A
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US2388060A
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US2526073A
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US2498355A
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US2487369A
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US2501962A
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US2621160A
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US2627642A
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US2642273A
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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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |