US3444783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operator devices
Assignee: Otis Engineering Corp
•
Filing: 1965-03-01
•
Granted: 1969-05-20
•
Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 John V Fredd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:31
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/261
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1994974A
Cited
US2026938A
Cited
US2568561A
Cited
US3072105A
Cited
US3182565A
Cited
US3251278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |