US3508367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building block
Assignee: Ethyl Corp
•
Filing: 1968-06-20
•
Granted: 1970-04-28
•
Expires: 1988-06-20
Abstract
No abstract record available.
Inventors
- 👤 Leonard M Niebylski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:11
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/04; E04B2/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US888530A
Cited
US903906A
Cited
US2201724A
Cited
US2394282A
Cited
US3038278A
Cited
US3263322A
Cited
US3221459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |