US3449138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate-impregnated magnesite brick
Assignee: Dresser Industries Inc
•
Filing: 1967-01-09
•
Granted: 1969-06-10
•
Expires: 1987-01-09
Abstract
No abstract record available.
Inventors
- 👤 Ben Davies
- 👤 George F Carini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:01
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/01; C04B35/03; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3141790A
Cited
US2947649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |