US3511306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for centrifugally casting perforated rings
Assignee: Certain Teed Saint Gobain Insulation Corp
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Filing: 1969-03-17
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Granted: 1970-05-12
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Expires: 1989-03-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph T Warkoczewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:47
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/04; C03B37/047; B; B22; B22D; B22D13/00; B22D13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2649652A
Cited
US2931062A
Cited
US3040398A
Cited
US3035317A
Cited
US3040395A
Cited
US3276082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |