US3528495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal insulation
Assignee: Darchem Engineering Ltd
•
Filing: 1967-08-25
•
Granted: 1970-09-15
•
Expires: 1987-08-25
Abstract
No abstract record available.
Inventors
- 👤 Edward Armstrong
- 👤 Peter J Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:05
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/08; G; G21; G21C; G21C11/00; G21C11/08; G21C11/083; G21C11/085; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3403807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |