US3489460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control systems responsive to the passage of a body
Assignee: Gullick Ltd
•
Filing: 1968-05-27
•
Granted: 1970-01-13
•
Expires: 1988-05-27
Abstract
No abstract record available.
Inventors
- 👤 Kenneth Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:12
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/08; E21C35/12; E21C35/14; E21D; E21D23/00; E21D23/12; E21D23/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2752932A
Cited
US2746395A
Cited
US2893427A
Cited
US3008018A
Cited
US3095819A
Cited
US3320001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |