US3436238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight refractory brick and aggregate
Assignee: Dresser Industries Inc
•
Filing: 1965-07-23
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Granted: 1969-04-01
•
Expires: 1985-07-23
Abstract
No abstract record available.
Inventors
- 👤 George H Criss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:22
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/068; C04B28/08; C04B38/00; C04B38/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |