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Patent US3016989A successfully refreshed from Google Patents.
US3016989A
Expired / Lapsed
US
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Elevator plant and its guide rails
Assignee: Individual
•
Filing: 1958-12-16
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Granted: 1962-01-16
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Expires: 1978-12-16
Abstract
No abstract record available.
Inventors
- 👤 Alvar N Lindmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:19
CPC Classifications
E; E21; E21D; E21D3/00; E21B; E21B7/00; E21B7/02; E21B7/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US394781A
Cited
US1356281A
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US1834652A
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US1888018A
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US2284360A
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US2531346A
Cited
US2514498A
Cited
US2780448A
Cited
US2874945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |