US2508968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of felted material
Assignee: R R Whitehead & Brothers Ltd
•
Filing: 1946-11-29
•
Granted: 1950-05-23
•
Expires: 1966-11-29
Abstract
No abstract record available.
Inventors
- 👤 Porritt Cyril Philip Muschamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:48
CPC Classifications
D; D04; D04H; D04H17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD OF HARDENING FIBROUS MATERIAL CONSISTING IN CONSTRAINING A NUMBER OF LAPS OF FIBRE BETWEEN A PAIR OF ELEMENTS IN PARALLEL PLANES AND ALTERNATELY DISPLACING EACH ELEMENT IN ITS OWN PLANE IN OPPOSITE DIRECTIONS AT TIMES ONLY WHEN THE OTHER ELEMENT IS STATIONARY.
Claim 2
Independent Claim
44 words
A METHOD OF HARDENING FIBROUS MATERIAL CONSISTING IN CONSTRAINING A NUMBER OF LAPS OF FIBRE BETWEEN A PAIR OF ELEMENTS IN PARALLEL PLANES AND ALTERNATELY DISPLACING EACH ELEMENT IN ITS OWN PLANE IN OPPOSITE DIRECTIONS AT TIMES ONLY WHEN THE OTHER ELEMENT IS STATIONARY.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |