US3250401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-erecting tower crane with bayonet joints between sections
Assignee: Caterpillar Global Mining LLC
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Filing: 1964-12-17
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Granted: 1966-05-10
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Expires: 1984-12-17
Abstract
No abstract record available.
Inventors
- 👤 Trevor O Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:51
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/34; B; B66; B66C; B66C23/00; B66C23/18; B66C23/26; B66C23/28; B66C23/283; B66C23/286; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7045; Y10T403/71; Y10T403/7123
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN A TOWER CRANE THE COMBINATION COMPRISING: A TOWER FORMED OF A PLURALITY OF SECTIONS; TWIST CONNECTIONS BETWEEN THE TOWER SECTIONS; A REVOLVABLE FRAME THAT IS MOVABLE ALONG AND REVOLVABLE ABOUT THE TOWER; AND JAW MEANS MOUNTED ON AND REVOLVABLE WITH THE FRAME AND ADAPTED TO ENGAGE THE TOWER TO ENABLE THE FRAME TO BE USED AS A WRENCH TO CONNECT AND DISCONNECT THE TOWER SECTIONS.
Claim 2
Dependent Claim
66 words
IN A TOWER CRANE THE COMBINATION COMPRISING: A TOWER FORMED OF A PLURALITY OF SECTIONS; TWIST CONNECTIONS BETWEEN THE TOWER SECTIONS; A REVOLVABLE FRAME THAT IS MOVABLE ALONG AND REVOLVABLE ABOUT THE TOWER; AND JAW MEANS MOUNTED ON AND REVOLVABLE WITH THE FRAME AND ADAPTED TO ENGAGE THE TOWER TO ENABLE THE FRAME TO BE USED AS A WRENCH TO CONNECT AND DISCONNECT THE TOWER SECTIONS.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |