Patent US3320704A successfully refreshed from Google Patents.
US3320704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof deck and method of construction
Assignee: NATIONAL ROLLING MILLS Co
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Filing: 1964-05-21
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Granted: 1967-05-23
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Expires: 1984-05-21
Abstract
No abstract record available.
Inventors
- 👤 Salem A Forsythe
- 👤 John J Roache
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:44
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/16; E04B5/17; E04B5/23; E04B5/29; E04B5/32; E04D; E04D7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
A ROOF DECK AND FORM ASSEMBLY COMPRISING A SERIES OF BOX SECTION SUB-PURLINS WELDED TO THE TOP OF A SERIES OF PURLINS TO FORM A GRID, SAID SUB-PURLINS HAVING A PAIR OF INWARDLY FACING TOP FLANGES FORMING A SLOT THEREBETWEEN, REMOVABLE FORM SUPPORTS POSITIONED ON SAID PURLINS, DEMOUNTABLE FORMS ON TOP OF SAID SUPPORTS AND EXTENDING BETWEEN SAID SUB-PURLINS AND IN SNUG CONTACT THEREWITH, CRADLES OF EXPANDED METAL LATH STRIPS WHICH ARE CORRUGATED AND VERTICALLY POSITIONED IN THE BOX SECTIONS AND EXTEND THROUGH SAID SLOTS, WIRE MESH SUPPORTED ON SAID CRADLES,
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) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |