Patent US2574221A successfully refreshed from Google Patents.
US2574221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a multilayered mat of intercrossed filaments
Assignee: Johns Manville Corp
•
Filing: 1946-03-16
•
Granted: 1951-11-06
•
Expires: 1966-03-16
Abstract
No abstract record available.
Inventors
- 👤 Modigliani Piero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
B; B29; B29C; B29C70/00; D; D04; D04H; D04H3/00; D04H3/02; B29K; B29K2309/00; B29K2309/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
THE METHOD COMPRISING FORMING A MULTILAYER MAT OF INTERCROSSED FILAMENTS, STRETCHING SAID MAT, ACCUMULATING A SECOND FILAMENTARY MAT ON SAID FIRST MAT WITH THE FILAMENTS OF SAID
Claim 2
Independent Claim
27 words
THE METHOD COMPRISING FORMING A MULTILAYER MAT OF INTERCROSSED FILAMENTS, STRETCHING SAID MAT, ACCUMULATING A SECOND FILAMENTARY MAT ON SAID FIRST MAT WITH THE FILAMENTS OF SAID
References Cited (Backward Citations)
US1771216A
Cited
GB323790A
Cited
US2015006A
Cited
US2117371A
Cited
US2131024A
Cited
US2081060A
Cited
US2306347A
Cited
US2315851A
Cited
US2397936A
Cited
US2399258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |