Patent US1833998A successfully refreshed from Google Patents.
Patent US4822026A successfully refreshed from Google Patents.
US4822026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Playing surfaces
Assignee: Individual
•
Filing: 1983-03-07
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Granted: 1989-04-18
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Expires: 2003-03-07
Abstract
Abstract Substantially planar, horizontal athletic fields comprising a substrate provided with a finish or coating of particles of an elastic plastic in the form of flat plates or scales whose length is at least 1.5 times the thickness of the plate or scale and a method of improving the abrupt braking qualities of an athletic field and the said particles.
Inventors
- 👤 Harald Schobermayr
- 👤 Erwin Krumboeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:20
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/06; B02C18/14; B02C18/148; E; E01; E01C; E01C13/00; E01C13/06; E01C13/065
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
a substantially planar horizontal athletic field comprising a firm substrate provided with a top coating or finish of loosely poured particles of an elastic plastic in the form of flat plates or scales whose length is at least 7.5 times the thickness of the plate or scale.
Claim 2
Dependent Claim
47 words
a substantially planar horizontal athletic field comprising a firm substrate provided with a top coating or finish of loosely poured particles of an elastic plastic in the form of flat plates or scales whose length is at least 7.5 times the thickness of the plate or scale.
Claim 3
Dependent Claim
23 words
The field of claim 1 wherein the particles have a maximum thickness of 1.5 mm and a maximum planar dimension of 5 mm.
Claim 4
Dependent Claim
35 words
The field of claim 2 wherein the thickness of the particles is 0.3 to 1.0 mm and the amount of particles on the substrate is 0.2 to 0.6 kg per square meter as a finish.
Claim 5
Dependent Claim
15 words
The field of claim 1 wherein the particles are based on a thermoplastic polyurethane elastomer.
Claim 6
Dependent Claim
17 words
The field of claim 1 wherein the particles are based on a one- or two component polyurethane-system.
Claim 7
Dependent Claim
14 words
The field of claim 1 wherein the particles are based on a thermoplastic rubber.
Claim 8
Dependent Claim
14 words
The field of claim 1 wherein the particles are based on a modified PVC-compound.
Claim 9
Dependent Claim
14 words
The field of claim 1, wherein the particles are based on a crosslinked rubber.
Claim 10
Dependent Claim
26 words
An athletic field of claim 1 wherein the coating is a finish layer wherein the lines on the field can be seen through the finish layer.
Claim 11
Dependent Claim
14 words
An athletic field of claim 1 wherein the plates or scales are substantially square.
References Cited (Backward Citations)
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US3736847A
Cited
JPS5374725A
Cited
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Cited
US4341836A
Cited
FR2498463A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |