US3389202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming shell roof structure
Assignee: Purdue Research Foundation
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Filing: 1966-02-07
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Granted: 1968-06-18
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Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Waling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:12
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/32; E04B1/16; E04B1/166; E04B1/35; E04B1/3533; E04B2001/3217; E04B2001/3258; E04B2001/3264
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF FORMING A SHELL STRUCTURE FROM A BENDABLE SHEET MATERIAL, COMPRISING THE STEPS OF: SUPPORTING A SHEET OF SAID MATERIAL IN A GENERALLY HORIZONTAL PLANE; SIMULTANEOUSLY APPLYING PRESSURE INWARDLY TO AT LEAST THREE CIRCUMFERENTAILLY SPACED PORTIONS OF THE OUTER PERIPHERY OF SAID SHEET TO THEREBY CAUSE SAID PORTIONS TO MOVE INWARDLY TOWARD EACH OTHER AND SAID SHEET TO BUCKLE TO A COMPOUNDLY CURVED SHAPED; AND SECURING SAID PORTIONS, IN THEIR INNER POSITIONS OT HOLD SAID SHEET IN SAID BUCKLED SHAPE.
Claim 2
Independent Claim
82 words
THE METHOD OF FORMING A SHELL STRUCTURE FROM A BENDABLE SHEET MATERIAL, COMPRISING THE STEPS OF: SUPPORTING A SHEET OF SAID MATERIAL IN A GENERALLY HORIZONTAL PLANE; SIMULTANEOUSLY APPLYING PRESSURE INWARDLY TO AT LEAST THREE CIRCUMFERENTAILLY SPACED PORTIONS OF THE OUTER PERIPHERY OF SAID SHEET TO THEREBY CAUSE SAID PORTIONS TO MOVE INWARDLY TOWARD EACH OTHER AND SAID SHEET TO BUCKLE TO A COMPOUNDLY CURVED SHAPED; AND SECURING SAID PORTIONS, IN THEIR INNER POSITIONS OT HOLD SAID SHEET IN SAID BUCKLED SHAPE.
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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |