Patent US5545580A successfully refreshed from Google Patents.
Patent US4957261A successfully refreshed from Google Patents.
Patent US3437012A successfully refreshed from Google Patents.
US3437012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve system for hydraulic elevators
Assignee: ABB Norden Holding AB
•
Filing: 1966-12-28
•
Granted: 1969-04-08
•
Expires: 1986-12-28
Abstract
No abstract record available.
Inventors
- 👤 Ludvig Bjorklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:49
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/34; B66B1/36; B66B1/40; B66B1/405; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87209; Y10T137/87217; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2272684A
Cited
US2359112A
Cited
US2495785A
Cited
US2501483A
Cited
US3113432A
Cited
US3276547A
Cited
US3216444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |