US3423895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof structure
Assignee: Certainteed LLC
•
Filing: 1965-08-25
•
Granted: 1969-01-28
•
Expires: 1985-08-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:10
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/18; E04B1/20; E04B7/00; E04B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1725808A
Cited
FR631028A
Cited
US2198450A
Cited
US2306107A
Cited
FR979299A
Cited
DE894754C
Cited
AT185091B
Cited
BE559211A
Cited
US3263385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |