US3234988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible load bearing wheel structure
Assignee: North American Aviation Corp
•
Filing: 1963-09-03
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Granted: 1966-02-15
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Alan F Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:52
CPC Classifications
B; B60; B60B; B60B9/00; B60B9/26; B60B2360/00; B60B2360/10; B60B2360/102; B60B2360/104; B60B2360/30; B60B2360/34; B60B2360/341; B60B2360/3412; B60B2360/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A LOAD BEARING STRUCTURE COMPRISING: A BASE MEMBER HAVING A PLURALITY OF SUPPORT ELEMENTS, EACH ELEMENT COMPRISING MEANS FOR EXERTING A SUBSTANTIALLY CONSTANT RESISTIVE FORCE IN OPPOSITION TO MOTION OF SAID BASE MEMBER, AND MEANS FOR APPLYING TO SAID BASE MEMBER THE CONSTANT RESISTIVE FORCES OF INCREASING NUMBERS OF SAID ELEMENTS AS MOTION OF SAID BASE MEMBER PROCEEDS, WHEREBY THE TOTAL RESISTIVE FORCE EXERTED BY SAID ELEMENTS INCREASES WITH INCREASE OF LOAD ON SAID BASE MEMBER.
Claim 2
Dependent Claim
76 words
A LOAD BEARING STRUCTURE COMPRISING: A BASE MEMBER HAVING A PLURALITY OF SUPPORT ELEMENTS, EACH ELEMENT COMPRISING MEANS FOR EXERTING A SUBSTANTIALLY CONSTANT RESISTIVE FORCE IN OPPOSITION TO MOTION OF SAID BASE MEMBER, AND MEANS FOR APPLYING TO SAID BASE MEMBER THE CONSTANT RESISTIVE FORCES OF INCREASING NUMBERS OF SAID ELEMENTS AS MOTION OF SAID BASE MEMBER PROCEEDS, WHEREBY THE TOTAL RESISTIVE FORCE EXERTED BY SAID ELEMENTS INCREASES WITH INCREASE OF LOAD ON SAID BASE MEMBER.
References Cited (Backward Citations)
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Cited
GB190601092A
Cited
US1167757A
Cited
US1063531A
Cited
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Cited
US3069021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |