US3540892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for flameproofing combustible materials
Assignee: WR Grace and Co
•
Filing: 1968-05-06
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Granted: 1970-11-17
•
Expires: 1988-05-06
Abstract
No abstract record available.
Inventors
- 👤 Edwin W Lard
- 👤 Carl W Orgell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:15
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; D21H19/00; D21H19/10; D21H19/12; D21H5/00; D21H5/0002
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) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |