US3387420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating covering element for built-up roofing
Assignee: Johns Manville Corp
•
Filing: 1967-02-15
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Granted: 1968-06-11
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Expires: 1987-02-15
Abstract
No abstract record available.
Inventors
- 👤 Ernest G Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
E; E04; E04D; E04D5/00; E04D5/12; E04D13/00; E04D13/17; E04D13/172; E04D5/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457
Claims Analysis
Total Claims: 0
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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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |