US3512556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-protective conduit system
Assignee: Individual
•
Filing: 1967-09-20
•
Granted: 1970-05-19
•
Expires: 1987-09-20
Abstract
No abstract record available.
Inventors
- 👤 Serge N Mckhann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:45
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1789; Y10T137/1797; Y10T137/1819; Y10T137/4673; Y10T137/4857; Y10T137/7722; Y10T137/7723; Y10T137/7731; Y10T137/7733; Y10T137/8158; Y10T137/8326
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) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |