US3499257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling structure
Assignee: Johns Manville Corp
•
Filing: 1967-12-29
•
Granted: 1970-03-10
•
Expires: 1987-12-29
Abstract
No abstract record available.
Inventors
- 👤 Robert Owen Heverly
- 👤 Andrew Michael Geller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:08
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/22; E04B9/24; E04B9/26; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45471; Y10T24/45524; Y10T24/45545; Y10T24/45586; Y10T24/4588; Y10T24/45942; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49863; Y10T29/49876
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1427782A
Cited
US1767745A
Cited
US2197418A
Cited
US2230349A
Cited
US2391792A
Cited
US3094201A
Cited
US3053359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |