US3229788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Invalid elevator
Assignee: WELDED PRODUCTS Inc
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Filing: 1963-06-25
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Granted: 1966-01-18
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Expires: 1983-06-25
Abstract
No abstract record available.
Inventors
- 👤 William M Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:31
CPC Classifications
A; A61; A61G; A61G3/00; A61G3/02; A61G3/06; B; B66; B66B; B66B9/00; B66B9/06; B66B9/08; B66B9/0853; A61G3/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
AN INVALID ELEVATOR, COMPRISING: A FRAME HAVING A PAIR OF VERTICALLY POSITIONED PARALLELOGRAM SUPPORTS, AND CONNECTING MEANS THEREBETWEEN; THE VERTICAL LEGS OF SAID PARALLELOGRAM SUPPORTS HAVING GUIDE TRACKS; A PLATFORM SUSPENDED BETWEEN SAID PARALLELOGRAM SUPPORTS AND INCLUDING ROLLER ELEMENTS IN OPERATIVE ENGAGEMENT WITH SAID TRACKS; EACH OF SAID PARALLELOGRAM SUPPORTS BEING ADJUSTABLE IN ITS ANGLE OF INCLINATION, AND INCLUDING LOCKING MEANS THEREFOR; AND POWER DRIVE MEANS BETWEEN SAID PLATFORM AND SAID SUPPORTS TO RAISE AND LOWER SAID PLATFORM ON SAID SUPPORTS.
Claim 2
Dependent Claim
81 words
AN INVALID ELEVATOR, COMPRISING: A FRAME HAVING A PAIR OF VERTICALLY POSITIONED PARALLELOGRAM SUPPORTS, AND CONNECTING MEANS THEREBETWEEN; THE VERTICAL LEGS OF SAID PARALLELOGRAM SUPPORTS HAVING GUIDE TRACKS; A PLATFORM SUSPENDED BETWEEN SAID PARALLELOGRAM SUPPORTS AND INCLUDING ROLLER ELEMENTS IN OPERATIVE ENGAGEMENT WITH SAID TRACKS; EACH OF SAID PARALLELOGRAM SUPPORTS BEING ADJUSTABLE IN ITS ANGLE OF INCLINATION, AND INCLUDING LOCKING MEANS THEREFOR; AND POWER DRIVE MEANS BETWEEN SAID PLATFORM AND SAID SUPPORTS TO RAISE AND LOWER SAID PLATFORM ON SAID SUPPORTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |