Patent US4359449A successfully refreshed from Google Patents.
Patent US4269232A successfully refreshed from Google Patents.
US4269232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective cap for pipes
Assignee: Von Roll AG
•
Filing: 1979-03-07
•
Granted: 1981-05-26
•
Expires: 1999-03-07
Abstract
Abstract The cap is an ethylene-propylene elastomer cup which is forced over the ends of a pipe section to protect the pipe end from damage and to protect the inside of the pipe from contamination by foreign material. A retaining bead on the outside of the cap lip prevents tearing and holds the cap firmly on the pipe end. The cap wall is about twice as thick as the floor. The outer perimeter portion of the floor is of increased thickness. One or two ring-shaped depressions centered in the floor permit the floor to be expanded radially when the cap is installed, so that a single cap size can be used for various pipe diameters. A ventilating port is provided in the floor.
Inventors
- 👤 Fritz Witschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:51
CPC Classifications
B; B65; B65D; B65D51/00; B65D51/16; B65D51/1605; B65D51/1611; B65D59/00; B65D59/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
In a protective cap which fits over an end of a section of pipe having a generally cylindrical wall portion and a floor portion fixed at and closing one end of said wall portion to define a cup shape therewith, the improvement comprising said wall portion having a greater thickness then said floor portion and a rim remote from said floor portion; means for increasing the retaining force of said wall portion comprising an endless circumferential retaining bead at said rim; and expansion means formed in said floor portion for permitting radial expansion of said floor portion, said expansion means comprising an annular depression of generally semi-circular cross section, said depression being centrally located in said floor portion and concentric with said wall portion and extending from said floor portion in the same direction as said wall portion.
Claim 2
Dependent Claim
138 words
In a protective cap which fits over an end of a section of pipe having a generally cylindrical wall portion and a floor portion fixed at and closing one end of said wall portion to define a cup shape therewith, the improvement comprising said wall portion having a greater thickness then said floor portion and a rim remote from said floor portion; means for increasing the retaining force of said wall portion comprising an endless circumferential retaining bead at said rim; and expansion means formed in said floor portion for permitting radial expansion of said floor portion, said expansion means comprising an annular depression of generally semi-circular cross section, said depression being centrally located in said floor portion and concentric with said wall portion and extending from said floor portion in the same direction as said wall portion.
Claim 3
Dependent Claim
17 words
A protective cap according to claim 1, wherein said wall and floor portions comprise an ethylene-propylene elastomer.
Claim 4
Dependent Claim
19 words
A protective cap according to claim 1, wherein said floor portion has an increased thickness near its outer perimeter.
Claim 5
Dependent Claim
17 words
A protective cap according to claim 1, wherein said floor portion has a small ventilating port therein.
Claim 6
Dependent Claim
16 words
A protective cap according to claim 1, wherein said wall and floor portions comprise an elastomer.
References Cited (Backward Citations)
US183953A
Cited
US1906182A
Cited
US1837345A
Cited
US2737205A
Cited
US4020874A
Cited
US4079756A
Cited
US4119121A
Cited
US4139005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |